Good stuff, IMHO. It holds detail very well, holds paint great - doesn't even require priming, just a wash to get mold residue off! - and if it gets bent, it springs back into the original shape unless it's forced into that shape for a long period of time. It has memory. Unlike metal minis, that bend and then break with the slightest provocation; I'm looking at YOU, Mad Dog.
Modding? It cuts easier than harder plastics, which can make it difficult to keep control if you're used to that firmer surface, but make some practice cuts and it'll be second nature. Just because it's different and new to you doesn't mean it's bad.
Oddly, the one problem I've had stems from its memory - when it's held in a new shape for a long period of time (like, in say, a package) it keeps that shape. Fortunately you can boil it, reshape it, dunk it in ice water, and viola it's fixed in less than five minutes.