I had a 'regular' Nova 20ga for a while.
Ergo's were very good, and it was light. However, I found it wasn't a natural pointer in trap, and you'll notice the sight ramp is considerably angled down compared to an 870 or 500. I also had severe short stroking problems with mine. If you don't really rack that plastic foregrip with authority, it won't shuck a shell like it should.
As mentioned good luck finding parts locally. Forget about finding say, an extended magazine at your local store. I sold it and got a 500. It feeds shells like they were born there.