Took me a little bit, but I got the wings to lock very securely in mobile suit mode. It locks together pretty good if you do it right (with the exception of the front skirt). I found it to be nicely posable, though balancing is a slight problem. The transformation system makes it a hell of a more complicated suit than usual though. I also had some issues with the led wiring, but finally got everything to work right in the wings. The other LED's were easy, just those wing wires were a bit of a pain. Overall outstanding kit though.
The more I think about it the more I think I want a Mk. II Titans one day as well.