Just took UDS off my 55cm bar the other day, put standard chicken loop on.
I was stoked at first with it because of the versatility. It allows you to ride hooked in with a little bit of sheeting, or unhooked with a lot of sheeting control. Being able to ride unhooked without going to full power is nice.
The 200% depower thing is BS, and I find my newer kites don't require nearly as much sheeting as it provides to go to full depower.
Another problem is my arms grew tired much more quickly and I found my self riding in a stretched out position all the time. I think this could be fixed with some adjustments, and I hear Naish is going to fix it and release another version of UDS. However I am a bit weary of spending another $130 dollars when I got one almost brand new sitting in my closet.
Maybe I will take a knife to it and see if I can fix it myself.