Quibble from a long time rsync.net user who had some critical data saved by them (http://en.wikipedia.org/wiki/2011_Joplin_tornado; they appreciated getting told that, of course):

The quota command hasn't worked for me for months or longer, perhaps correlated to their switch to ZFS. Not a great problem with the web administration page, although that doesn't show your current right that moment usage, or I can just use du.

They are otherwise everything a savvy UNIX(TM)/Linux/BSD/* user could desire. Even recently? increased their support for git.