It's a mini ITX form factor and has built in Wi-fi and bluetooth... that is about all it has going for it. It also only has 2 DIMM slots.
The Gene is Micro ATX and typically has more ports than the ITX version. I think the Impact has more USB 3.0 ports though.
I'd personally get the Gene unless you are building a compact sized PC that requires an ITX board. The Hero is the full ATX board, which is what I have and am very happy with. Just make sure you review the features you would like before purchasing.