I just picked up a WE PDW this last week, and so far i love it. I've had a few parts on it break so far, but nothing too major, and everything is pretty much fixed now.
I had the stock hinge break, and I will be fixing that shortly.
The bolt catch wasn't working, but i did the heat shrink modification like someone else in the thread did, and it works properly now
And both of my mags leaked, but those were both fixed too
I've played a few rounds with it so far, and i love it. It has pretty good range and accuracy for its size, and it is 10x more fun to play with than any of my aeg's.