The technical excellence of the Gravis Ultrasound makes it less interesting IMO. It did everything right, so it has no individual character. I prefer hardware that cut corners, e.g. the Amiga's Paula chip, with its hard panning and lack of built in anti-aliasing filter. Technically "bad" sound hardware can have a unique and distinctive sound that's still interesting today. The GUS just sounds like a lower specced version of modern hardware.