Quite good. You have to to this every single night for at least a week before you feel to the true benefit, but that is what she says on the CD so no surprises there. This isn't a quick fix if your having sleeping problems in the short term, but if you are consistantly having sleeping problems over the long term then this product is suited towards you. I have been using the CD for over a month now and it has improved my sleep, however the other reviews on here make out that they didn't even have to finish the track before they fell asleep, that is not true for me, but I normally do get to sleep not too long after the track is over. There are 4 tracks, the 1st is an introduction to the cd, 2nd is quick fire relaxation techniques and the 3rd and 4th are 2 15mins long guided relaxations. I used track 3 the 15mins visulisation to help me sleep, I found this better than the one on track 4, but I think this is just personal preference. The quick fire relaxation techniques on track 2 are quite good for if your stressed in the day, the only thing I would say is you can't just listen to the cd and do them at the same time, you will need to pause it to do them, however you don't have to do them all you just have to work out what works best for you. The ladies voice is pretty neutral and calming, nice to have an english ascent, as I don't think I would cope with an America one. Some people have commented saying her voice is a bit posh, but I would say that is pretty similar to the standard that you get in the BBC news reporters, well spoken, but not a plum in their mouths. There is a little calming music, but mostly it is the lady talking, if you like listening to whale music to relax, this product is not that, the music is used to aid the lady talking and the relaxation process and to help with the visulisation. All in all I think this is a good product, don't expect it to be a miracle cure, keep listening to it and practising and you can take the techniques and apply them when you do not have the cd to listen to. Although it might be a little more expensive than other cds of this nature I think it is worth it. Sorry if this a long review, but I struggled to find all this information in one post anywhere, so hopefully I have given everything that someone would like to know when they are trying to find out about this product.