Yeah, I tend to stay away from elsif. Of course there are exceptions (aren't there always?), but I find that creating a logic flow that depends on lots of elsif calls just encourages people to continue expanding the structure long beyond the point it should have been refactored (case in point - one of our monolithic scripts has something like 30 or 40 chained elsif statements)

Yes, I agree that unless has a small useful footprint, but I also think that if and elsif (especially the latter) are very easy to abuse.