At work, we just got another 8 unit bike rack (we now have 4 bike racks). It's not bad. Bolted to the floor in a secure parking garage next to the entrance. The only problem is that the spaces are too close together. This is invariably an issue with people who ride flat bar bikes as commuters (i.e. most of our commuters). Flat bars are generally 58cm wide, versus 42cm for traditional drop bars. So when you get a bunch of flat bar bikes parked in the same rack, some spaces become unusable. Also the space for the wheels doesn't allow for tires wider than 2" which is a problem for some mountain bikes. It's also really hard to get to one's lock since the rack is bolted next to a wall. Because of this, I try to park as close to the end as possible. Fortunately, I'm often the first one in, so the rack is wide open when I arrive.