This thread has been a great source of information on all Mini/Micro quads.
I own and fly the MqX, but had an opportunity to fly my co-worker's UDI 816 the other day. This is an awesome and stable quad... after you fly a few batteries, you can make it do what you want... hover, loop, stunts
This is my video from Day 1 Battery 3... I am not the best pilot, but had a blast on this mini quad
This has made me bring out my MqX from the basement to the office !