Here's my review for the Airzone Punisher Gatling gun. To sum it up in one sentence, it looks a great deal cooler than it functions. I never operated a Vulcan so I will not be comparing the two here.

Jumping right to the heart of the matter, good stuff: it shoots about 30 feet no problem and it has no air restrictors in the belt like the Vulcan belt. It has the cool motorized barrels that turn and its full auto of course. One of the best points is that it has good ammo. The rounds have a flat head and no random holes or hollow spaces that make their flight go all erratic.

Now for the bad points, first, the gun jams frequently. The belt is such that the ammunition sits loosely in the ammo holders and what happens is that the rounds tend to slip out too easily. When they slip out, their rubber tips tend to drag in the feeder and it takes very little effort to stop-up the chain. This would have to be fixed in the modding stage. In its stock state, I can't clear one belt without a jam.
The next problem is that its not a Gatling gun! The barrels are all false, the rounds just shoot out the middle like the Vulcan does. Kinda pissed about that.

Anyway, there you have it in its stock version. I'm disappointed. It needs modding just to get it to work out of the box.

Price is about $40 at ToysRUs.
Would I reccomend buying it? No, unless you had a mod in-mind for it. Oh, that reminds me, the darts have the flat rubber head as I mentioned. If one were to rebarrel the gun for this ammo, forget it! The diameter of the rubber head is larger than the foam. This means it will not smoothly run down a barrel, not to mention that the head is too big for PETG. So to rebarrel you have to change ammo.