I've played Starfarers of Catan(BGG|Wikipedia) once and loved it. Usually, I only have one other to play board games with. I'd like to know how similar Starship Catan(BGG|Wikipedia) is so I can decide whether it's worth the purchase.
It has some similar ideas (e.g. your ship gets new abilities as you build it up), but it's really a totally different game. And, I think, a better one.