I abolutely love it here! I just started coming a few months ago and I have found it to be just the right gym for me. The classes are excellent and they have a ton of them, I have been going to spinning and the instructors are very enthusiastic and motivating which keeps me coming back. The staff seems friendly, I haven't really needed anything, but they seem to be around all the time. It honestly has been better than I expected so I plan to stick around for now. If you live in the allston area it is worth stopping by to check out-it's kind of hidden so map quest it first but once you are inside it has everything you would need.
Pros: Lots of classes
Cons: hard to find, charges a dollar to park at night