I'm a southpaw as well and I bought one of these a couple of years ago. While it is accurate enough for plinking and perforating zombies, I do have a couple of issues. However, they may be related to the finger tip on my left hand bird finger being unbendable due to having been broken as a teenager.
So, first off, I do find there to be a little too much back to front reach on the grip because of the inability to bend that finger tip, also, I find the mag release to be in an awkward position, seeing as it is on the frontstrap.,,I have accidentally hit it a couple of times. But again, this could be because of my inability to bend that finger tip...and yes, it can be a pain on other guns as well, but I seem to notice it more on this one.