If you've purchased CGP books in the past, whether the KS3 ones, or GCSE ones, then you'll have a feel for the style they're written in. The AS and A2 books are no different. The CGP style is still there, however they're obviously targeting a more mature reader.
There isnt a great deal to say really, if you're not familiar with the CGP style, i'll explain. The books have a slight sense of humour to them, and are well laid out with colour highlighting important bits, key equations in boxes, and things like that. The style of explanation is simple, and easy to follow, and can help to make seemingly complex topics seem simple, which is great.
The book covers pretty much all sections for ALL courses, which is important. If you know what course you're doing, it makes it easier to read, as there are sections which say "OCR B only" or "Not AQA A" which can really help identify which bits you need to know.
All in all, a good revision guide (as with the A2 one) and I would highly recommend it to anyone doing A-level physics. I've always been a fan of the CGP books, and this one shows exactly why.