The cymbals are the largest shortcoming. The samples are so much shorter than today's (memory limits, I suppose), and it's really evident as the sound dies out. I still have a Korg i5s, and I could definitely get by with those sounds, if I needed a backup. Since much of my live work is a stripped down sound with mostly Vocal, Rhodes/Piano, Bass, and Drums ... I appreciate how far the tonality has progressed, and I enjoy hearing the sound as realistic as possible.
A good friend of mine still uses a Pro-E for his live bass lines. He uses a dedicated bass amp, so that helps the realism, but the core sound is still 1980s Roland.