Insanity: The Ultimate Cardio Workout and Fitness DVD Program.

I've completed month 1 and I'm now on day 5 of recovery week. It has been tough, however I'm halfway there so will keep at it.
Where to start? I knew instantly that I was going to get INSANITY the very first time I saw the infomercial - it's like it called to me! I had been doing Taebo and S.W.A.T. for a number of years, and more recently 30 Day Shred, so INSANITY was naturally next level.
Although I have been unable to complete all repetitions in the circuits, I'm not too bothered as the "superfits" on the DVDs also struggle - even Shaun T himself!
These workouts are not impossible (though it seems that way while you're doing them), they're just extremely challenging and if you can dig deeper and persevere, you will overcome and get amazing results. I can already see more AB definition and my glutes and arms are firmer.
The actual workouts are only approximately 15-20 minutes but they feel (much) longer due to the intensity of the circuits.
The leg lifts in the Cardio Abs are a killer, as is Cardio Recovery - do not be fooled into thinking otherwise! Shaun T says he's not trying to hurt me but it certainly feels that way sometimes.
The Elite Nutrition Guide is easily followed (YOU WILL NEED TO EAT TO GET THROUGH THESE WORKOUTS!!) as most foods are what I regularly eat, though not necessarily in the same combinations ie. Peanut butter and fruit jam on wholemeal bread with cottage cheese.
I'm mentally preparing for month 2 which I know will be difficult, however as with month 1, I will do my best and try to get better as I go along. INSANITY is very hard work and I'm loving my energy levels and the way my body is visibly changing.
BRING ON MONTH 2!!!

UPDATE 8APRIL2011
I've now completed insanity and am very pleased with results! I've posted my before & after photos and have sent off for my T shirt. I'm having the rest of this month off and will restart the madness next month.

UPDATE 12DEC2011
I've completed another round of Insanity today and I look and feel fantastic! My results this time round are even more impressive as I've learnt to pace myself during the workouts, which enable me to get many more reps in. The satisfaction I get from ticking off the daily boxes is immense and I smugly wear my INSANITY t shirt (almost) everywhere.
I have been asked a few times if I go to the gym, and when I say "yes - my living room, 6 days a week", then follows: "6 days a week!! Are you training for a marathon??" No, I am not training for a marathon. This is my new WAY OF LIFE and I love it! I've adapted to the Elite Nutrition meal plans even when I'm not on Insanity as the meals are simple, nutritious and keeps me fuller for longer.
The workouts are still challenging and I still struggle with the double leg lifts in Cardio Abs and the side push up balances in Max Recovery.
If the full cost of Insanity is too much on the pocket in one go, [...] offers payment in instalments.
During the festivities, I'll be taking it easy with Pilates, yoga & Zumba, trying not to overindulge and will rev it up again come January 9th.
So if you think you're fit and/or looking for a new challenge, give Insanity a go. I. Dare. You.

I bought Shaun T's Insanity mainly as I didn't have time to go to the gym, and, as it requires no equipment, provided a no hassle workout. I paid just over £60 for this and I have to say, it is well worth the price tag, especially if you consider a gym membership will set you back £30 a month.
The layout itself is great, 16 DVDs worth of intense cardio regimes that WILL challenge you, regardless of level. Even as you imrpove, the concept lies around the principle that you must increase your intensity, an idea that you can't help but follow as you begin to see results. Honestly, try the regime, and after 3 days, I promise you will see results. I've done workouts with my brother, friends, and girlfriend and each have shared the positive reviews with me.
I've been heavily into exercise for the past 5 years, and consider myself fit, but regardless of that fact, this program pushes me to my limits, and I feel fitter, more agile and more energised than ever. Shaun T's exercises are inventive and fun, as well as challenging, and the manner of each workout forces you to push through your pain to help you get results.
Present is also a very informative food diary/nutrition plan, however I was unable to keep up with the demands due to long working hours. I would recommend that those who are interested in this DVD focus on the content of the workouts, and if, like me, you are unable to follow the food, just be sensible (don't eat lots of crisps and try to at least eat some of the foods suggested, just not at the frequency suggested). Even without the nutrition plan I got great results in the first 3 days, and after the first month I had seen my body fat percentage drop from 11% to 7%, a huge drop that really shows across my torso and abs, stripping away the fat that previously covered my 6 pack.
Everyone has a 6 pack, the difficulty is in unleashing it by breaking through the fat on top, and as you unfortunately cannot isolate fat loss, this DVD shocks your body into all round fat loss that will leave you ecstatic, trust me.
In terms of ease, this beats P90x by a long shot, the fact no equipment is required is just a bonus.
This is well worth the price tag, and you will be glad you bought it after you've done your first DVD!

WARNING
As with everything, it does require willpower, and the DVDs won't do the work for you, you actually must participate and push yourself.

Stuck with this program and achieved amazing results cannot wait to take my shirt off at the beach now!Did not realise I could get this toned without weights. The workouts are so intense you forget time and it is all over before you know it. I feel a lot better every morning when I wake up have boundless energy, more productive at work and can stretch myself into difficult yoga positions and martial moves that was impossible before! Cancelled my gym subscription so this workout program has paid for itself