TF-11 hands down in that list. I have the black version and it's a badass little gun for the price. It may be a low end gun, but it's a beast. The only down side is that the fixed hopup is set for .2, and even then, it's got a pretty limited range of about 50 feet before the BBs drop.
You could use it as a primary,but would find yourself at a disadvantage. I prefer to use it as a secondary instead. I used it at Op Broadsword in Picton a couple of weeks ago. Pulled it twice in confined spaces where my C8 was too big to manoeuvre, and it got me 4 kills. I love this thing and plan on using it more.