Gordon,
it has standard GM soundset too. Is it good? It's OK for a 23 year old synth. (This is emulation of a hardware unit)
I would say prime usage is just to be able to play GM stuff. And if you are after a particular sound. But...if you are looking for somewhat realistic sounding instruments, this is not it. The best overall software option that would map GM automatically and do program changes in my opinion is Halion/Sonic (full), but the newest version has issues with GM. So it has to be a version before that. For the price, Roland VA is not bad.
I think the ethnic, percussive, and drum sounds still hold up quite well. There are may others that work well when layered or as part of a large mix. A lot of them were done by my friend Eric Persing who went on to form Spectrasonics (Omnisphere, Keyscape, Trillian). I used to work for Roland as a writer.