I'm a fybre member and I really love it. I am not in the best shape and have a lot of work to do, so fybre being small is great. I don't feel intimidated about equipment; they have really nice new equipment and are great at helping you plan a program.
A big component for me with regularly attending a gym is proximity. I go to Fybre more than I did to Virgin because I don't have to drive.
The classes are expensive if you don't pre-pay and the children's yoga classes are not included EVEN if you do pre-pay which kind of stinks. The classes are great though and you will even find several of your non-member friends still go there.
Few tweaks but overall a great gym.