My recommendation is to talk to your local shop and make sure that they can service it. I had a Oceanic Delta for 15 plus years I bought used when times were tight with never a complaint about it. My only issue is they quit making parts for it, so.... I’m in the market for a new one. I’m under the impression that Sherwood hasn’t ever discontinued supporting a regulator from my dive shop, but.... never say never.
Also watch where you buy it from, some places aren’t licensed dealers so you might have warranty issues. Amazinly Oceanic has info on their site about it, so it must be as much as issue as my local shop says....