As for WE in general:
I bought a WE P14 last year and it has been pretty good since. Slide and mag are a bit loose and can rattle a little when you shake it laterally, but not a major issue for me. Shoots well even in cooler days but that might have been because I had a bit of CO2 seep into my propane tank when I was topping off my 40mm's. Mags were then topped off at the field not thinking. The P14 is capable of shooting CO2 so I was worried more about the seals blowing before issues with the gun.