It's pretty usable at this point. One problem with it (and any of the other tiling solutions), is the drop shadows OSX adds to windows. When you have your windows flush with each other they look pretty bad. Shadowkiller(http://unsanity.com/haxies/shadowkiller) removes all of the drop shadows. It claims to be incompatible with 10.6+, but I'm running it with no issues on 10.8.2 and have on most versions of OSX since 10.7