Most are very electronic sounding, although there are some I found acceptable. The organ sounds are great. Sound ranging from various drawbars to rotary orgs, 60's and 70's organs, pipes, etc. Synth brass and lead synths are good sounding, although I don't use much of those. The synth pads are a bit weak but should meet your needs if you're not heavy into New Age or Ambient tracking.
Orchestral sounds offer a good variety of strings, horns and woodwinds.
Most of the 8820 map strings were a bit synthy sounding, but there are a couple of variations that sound better. Choir and voice sounds are typical of most units I have heard. They sound sampled and sound fake. Accoustic guitar sounds are pretty good. The Rock guitar sounds aren't anything to get excited about though, except there is one variation that offers a power chord type variation that's pretty cool.