The acoustic patches of the synth are pretty much of its time. There are far more natural sounds nowadays, especially the guitars sound cheap. On the synth side again you can do great stuff. Creating wonderfully thick cold digital pads ain't a problem and yet the X5D manages to remain a certain warmth.
This keyboard is decent, but don't expect great things from it. Most of the factory sounds are mediocre at best, but there are a few organs, pads and electric pianos that I really dig! I use this one live with my cover band Broken Voice, mainly for the organs. You can use the mod wheel to make the rotary effect and it actually sounds pretty realistic!