The G&G I really like. Honestly every gun on the list as ran great except the AK.
APS has an issue with the wiring clips for the motor. They keep snapping and losing connection, the one of the scars had a feed issue at one game and never happened again and the 1911 had leaky mags. But all this is quick fixes.
I have yet to have any major issues with any of the guns. The G&G are 2 of my Favs because they are so light but perform just a well as the Full Metal guns.