Is 150 fps good

It depends really. First off if you are doing CQB's (close quarter battles), it would be OK. Also what BB's you are using? I recommend .20 but nothing less than that. Anything under that is HORRIBLE. So it depends what you like but it is OK. I also would buy an 345fps to 400fps or anything in the 300's if you can. Oh, 150fps is pretty good for a pistol but mabey not an atomatic. Hope this helps!