I got the SXK clone and liked it so much, I got the original. So far, the only difference I found was that the clone uses an o-ring to tension the AFC ring whereas the original uses a short piece of wire. My AFC ring was a little loose because they used a very thin wire, maybe 30 guage. I replaced the wire with a 11mm piece of 24 ga. SS wire that was hard to install. I think 26 ga. would be perfect.
Performance wise, the clone is every bit as good as the original Rose3, with the original maybe a tiny bit smoother and quieter. For the money, I don't think you can go wrong with the SXK clone. I'll try to get a SJMY clone next.