I've recently joined up with Bike Park since starting a new job as a suit. I gotta say that overall, I'm pretty impressed. It's convenient having a place in the city where you can leave all your stuff, have a nice hot shower, iron your clothes, and get changed before work. It's almost a Clark Kent/Superman thing... you go in to Bike Park as "Oh, well, I just did a short smashfest down to Mordialloc" Superman, and you emerge (albeit some time later) as "Pressed suit, shirt, trousers and tie" man-about-town Clark Kent.
Of course, some are lucky enough to have lockers/showers and such at work. But for those that don't, and even those that do, it's another option worth considering. I gotta say, the whole thing is quite well thought out. There's nice soft but grippy astroturfy stuff in the main area so that you don't wear out your cleats too much, fresh towels, gorgeous eucalypt based soaps, and the option of valet laundry. I get a sense of being pampered most of the times I am there
Not cheap, but well worth it.