I joined Top Notch last night. Which is why I'm walking like RoboCop today !! I used to be with Fitness 1st, but the one at London Bridge aint good.
Top Notch may well be more pricey, but loadsa classes [including one I was recommended for yoga] plus pool.
No info about Fitness Exchange, but why don't you have a look ?
if you do a search on here - i am hopeless at this kind of thing, you will find a thread on gyms. i used to a member of topnotch, but ended up having to leave because it is the filthiest place in the world. a number of us did not rate it. am now a member of cannons which is pricey but is very clean, has classes all day every day, has 2 pools (one for serious lengths and one for a calmer pace), plus the lovely spa pool and is massive. couldn't be happier with my move
I'm surprised by the comment about cleanliness, as that was one of the criteria for selection. I'm not an expert by any means, but it certainly looked clean, tidy and well-maintained. By the comments above, it sounds like they have pulled their corporate socks up !
So far, I've found the place to be staffed by smiley, helpful staff and I even managed a conversation with one of the other red-faced, sweaty protagonists. Nice fella.