Oh yeah, the Herron gets pretty good marks from everyone who owns one! Had mine since late last year. Easily the best component I've ever had. Or ever will, probably. Turns out there's a reason why they hardly ever come up used, and go in a flash when they do. My search turned up several people who had heard the various Herron versions go head to head with all the much more expensive supposedly best stages- even the earlier 2, even the original Herron, total match for anything out there. I don't want to diss the others, at this level there are no bad choices. But I did come across several people who said the Herron was better than ... fill in the blank.... and then added, and that wasn't even the current one! So you could get a used one (if you can find one, seriously, not easy- Itried!) and be very, very happy.
But, why buy used? Why not just give Keith a call? I'm sure he'll be happy to build you one. He builds them to last, with fanatical obsession to detail.
How much difference can it make? Might want to check out my review. My wife heard it through a closed door! Cannot recommend enough.