I have fished quite a few beats on the Eden Rivers scheme (Go Wild) and also had a first dabble on the Peak Passport one a couple of weeks ago. I also have the book for the Wye & Usk one but haven't yet had chance to take advantage - bit of a trek for me with my limited time. However, I spend a week fishing up in Cumbria every June and for the last 3 or 4 years we've sampled a good few beats on the Eden scheme during that week. The Wye & Usk has lots of water, as does the Eden scheme. The Peaks one is just in its infancy really so only a few beats so far and quite short ones generally too.
My comments are that these are good, worthy schemes and provide a great opportunity for the day ticket angler who likes to get away from the crowds a bit and experiment on some untried water, usually in fantastice countryside. Also, once you have a book of vouchers you can go when it suits you, no hassle, and the vouchers are even interchangeable. However, it is worth setting aside some time for checking beats out first, or on the day for a few hours before fishing, as they are not always what you might anticipate. Take good maps and have a few reserves lined up so that if you turn up to fish a beat and its a bit less accessible than you thought, or you just don't fancy it much, you can head off to another one. Also, if its a short beat it won't last you all day (if you're out for a day). They are very varied and inevitably are the bits the clubs don't want, so can be a bit hit and miss, but half the fun is finding out - just be prepared to be flexible and adapt to the situation as you find it.

. Oh - some of the prices are variable too - the Wye & Usk beats are generally more expensive than the Eden Rivers ones (for example - many of those are just 2 vouchers, ie a fiver, which means you can do a few in one day if you fancy and still not spend much). Have fun!