I know this will cause no end of people telling me gas is better but I own 2 gbb pistols and 1 nbb. During the winter I was sick of cooling mags and the depressing hisssssss. I bought (for £60) a cyma cm 030 pistol (glock electric pistol) and I love it. I mainly play cqb at night and for this it is perfect. Not very powerful only around 220 fps but the hop unit is great. It's so good I now have two. I have just ordered two extended mags (80 rounds). Keeps me mobile and usually find myself taking point. Especially good if in a team with a good mix weapons.
Still havnt gone back to my gas pistols and don't know if I will.