I have one that I bought new three years ago. Do see some older steel models now and then but don't think that I have see too many newer ones.
Like all smaller framebuilders, it is a tough business. I went to the Marinoni site a few weeks ago and noticed that they had moved to a XS,S,M,L sizing rather than offer the more traditional sizing options. Probably driven by more cost effective inventory management. Can't recall if this was always the case with their carbon models as I went with a frame that was still welded in Montreal.