The VSC is a typical GM synth. Most of the sounds are OK, but you won't confuse it with a JV1080. The piano, strings, and other acoustic sounds are too thin and simple. As with most GM sounds, these will be fine hidden in a mix, but you wouldn't want to use them as the main sound in a tune.
Some of the drum and bass sounds are usable.
It's very stable, and comes with hundreds of sounds, so that's a good thing.
If you do MIDI karaoke, or anything else that requires a GM synth, the VSC is a good one to have.
And if you get SONAR, it's free, so what's not to like?