I have my own bike but still use couldn't because often 1) I need to go one way (when i don't want to arrive sweaty, I'll just take the bike home), 2) I can't lock my bike- increasingly bikes can't be locked in whole chunks of Manhattan/Brooklyn without getting stolen 3) when I'm in a rush- getting my bike out of my bike storage takes 12 min due to all the doors i need to go through and how many bikes there are. 12 min is sometimes my entire commute on a bike.