I haven't owned one but a couple friends have.
Awesome in the snow and on gravel.
Pretty indistructable like most e30's - but - the transfer case holds like 3 drops of fluid and if the owner ignored a leak it can get eaten up fairly quickly. Diffs are not the easiest parts to find. Otherwise normal e30 issues.
1988 is the best year. They had a lot of things that were options or dropped in following years. ie sports seats, ellipsoid lights, power sunroof, trip computer, map light mirror and possibly a few other things. Nothing that couldn't be retrofitted though. All 88s were 2 doors though and had the larger bumpers.
Check out the ix registry at:
http://home.earthlink.net/~wardellhix/iX/