This was exactly what I was looking for to compliment my wii fitness regime! I had read about Gold's Gym and was really keen to try it, and disappointed when I first heard it was not available here. So delighted when it came out under this cover. I have read the other reviews, and am slightly baffled at the people who rate it really low for poor graphics etc. If you were getting this type of game for the graphics then I would be surprised, and frankly I can't see a problem with them. There are loads of different lengths and difficulties of warm ups and shape boxing programmes, each of which tells you how many calories you can expect to burn before you go in, so you can really tailor your workout for what you are hoping to achieve. The 'exercise' things (skipping, sawing logs etc) are less of a draw for me, as I am happy losing myself in the boxing, although there is one that has you ducking and dodging punches from a strange terminator type machine (!?), which if you do it everyday as part of your routine will bring great results for the old waistline. If you do an 8 min warm up and then 16-20 workout I would challenge you not to feel as if you have had a good workout and be sweating. A real plus is that you have to keep your legs moving so it is for the whole body, not just the arms. Beware the first time you use it as my arms and legs ached the next day!
I suspect that like all other exercise games for the wii you would eventually get tired of this if it was all you did. Personally I combine a 20-25 min work out on EA active, 30 mins on this, and 10 mins yoga on wii fit to get a really good all round work out, that IS bringing results (visible shape change within a week :-)