Its cheap because its enthusiast designed and built so no one is making lots of money on it and because no support has to be present for it that costs money cause its enthusiast supported as well.

Its a very good idea when cost is an option, but be careful which one you end up with, some of the early ones were an 8*8 map and even if you REALLY know what you are doing with setting load site break points you are going to struggle with only 8 points!

I dont know enough about them to tell you which ones have which map though, i would imagine that the V3 is ok though.