never used an ultralite so cant compare there.
However, they are very light. accuracy is pretty damn good, i just cant hold my marker still enough to get it ball on ball.
Pretty sturdy, well mine has survived a few dives and digging sessions with me so hopefully they are all quite good.
If you manage to get a ball break, it shoots through em well but accuracy is noticeably affected, having said that it isn't too bad, goes in the general direction you point the marker at.
Not a great range of bore's to work with but you shouldn't have any trouble with finding one thats not big enough.
hope that helped