Thank you sir!Asking if a PSU is good after you bought it isn't the best way to do it... but in your case Seasonic Focus GM isn't a bad choice, depends on the system its attached to.
main differences between GX, GM & GC are the cable options it seems, GX is fully modular, GM is semi modular and C has all fitted cables.
Seasonic FOCUS GM-650 650W Power Supply Review - Page 2 of 7
We test the affordable Seasonic FOCUS GM-650 650W Power Supply and see how the new OneSeasonic Initiative works out.www.thefpsreview.com