Ubuntu 14.04 (Trusty Tahr) is still in the development stages, and even if Canonical no longer releases intermediary Alpha versions, it can be considered as such. Even so, it's strange to see this operating system work better than the previous stable one released just a few months ago.
I got a chance to work on Ubuntu 13.10 (Saucy Salamander) well before the launch and a few months after its official release. It wasn't a stable OS before October, and it has been plagued by a few annoying problems, like the Unity panel freeze issue, after the launch.
On the other hand, I started using Ubuntu 14.04 (Trusty Tahr) a month ago and, with the exception of a single reported crash of the Trash (which doesn't seem to affect the functionality of the system), it works flawlessly.
I can even say that it's way faster that Ubuntu 13.10 and I hope it stays that way until April. I think this is the first time when a development version of Ubuntu works better than the previous stable one, but there is no reason to complain.