I've bought a lot of westerns (silents and early talkies) from Sinister Cinema and some Euro horror / sci-fi titles. About 65-69 titles altogether, mostly westerns dating from 1914 to 1936. Haven't seen their spaghetti western releases. They specialize in transferring 16mm prints of rare, lost, and public domain films. The quality is always on the analog scale, the chemical scale as opposed to the digital scale. They are not in the business of restoring films and they make no false claims. They do clean the prints before they transfer them. Never had a technical problem with a Sinister Cinema disc. They are as honest as the next guy, and they do the best they can. All in all, I recommend Sinister Cinema.
I didn't know about Cultcine but if Hoover Valentine would care to share the link, post it here or PM me.
Also, tell me which titles, specifically, you were happy with.