Mine works well most times and I use it to spot check my students "fix" occasionally when in different aircraft. Occasionally on the latest version it freezes the screen, locking with the plan profile insert, or whilst inputting diversion waypoints, it locks up, and won't release the keypad input screen or sunscreens like HSI, ( yes I have the lock off!). It,s just enough of an issue for me not to thoroughly trust it and perhaps this is a good thing. I,m old school who loves the new stuff, but it is not perfect or fail safe yet....
Keep working guys, this is the future, but as Gates did with windows, it still has problems, trust the old ways.