I've so far bought two of these kits, and I only have a few complaints.
The first being that the wires come with a far too short to actually use, the second is that I've had a lot of problems with the darts just fluttering through the air because the canted flywheels can put too much of a spin on them. The orange barrel seems to help but they still occasionally flutter which is really bad if you are trying to hit anything from range.
But, other than that it's a great kit!
NOTE: I have one of these in my hyperfire and it loves to rip the heads off of the darts!