Awesome UI! I already recommended it to my guild, it is awesome! I did let them know it is in beta phase, so, a few might wait out till its final stage. Im sticking with it!
OK, I did notice something, its not major, mind you, but when you open containers and use the container X to close, the container still stays open in Inv, so, you have to Double click to close it in Inv and then you are able to open again. Like I said, nothing really HUGE, but its the only thing wrong I have found so far.
Keep up the good work!