All I can say is the Mercedes ML Class had TERRIBLE quality problems when it was first introduced. It was, by far, the worst vehicle in recent years in the JD Powers and similar surveys. This killed the ML Class resale value making used ones cheap, but questionable as to whether you'd really want one. It also means you'll take a big hit on depreciation on new ones. Not sure if you're thinking new or used, but I think there are better choices either way.
I do know that DaimlerChrysler is going to do a full redesign for 2005, and it will share a common platform with the new Jeep Grand Cherokee.
I'd certainly shop around before buying, comparing against other "prestige" SUV models like the new Lexus RX330 (gorgeous!), BMW X5, and Land Rover Discovery. I also think the Chevy Tahoe is a worth considering, it is bigger and therefore a different kettle of fish, and while not quite as ritzy, you do get a lot for your money.
I can say that my mother has a Lexus RX300 (probably a 1999?) and loves it; its a nice size, rides and handles like a fine luxury car, and has been totally trouble free. My dad has a Tahoe and loves it, it's a bit more "trucky" which he likes.
Since I personally won't be in the market for any of the above, take my advice and consider it worth what you paid for it! /ubbthreads/images/graemlins/smile.gif
Good luck; wish I had your predicament!
Dave