bought mine about two years ago, and still love it!
Check out my page (www below) and check out at some of the car's specs and pics of my car.
As MB Doc says, the evaps are a problem and if they go, it's not pleasant. Check out this link to see for yourself.
http://people.ne.mediaone.net/fmulone/140/W140.html On the other hand, my A/C system has not given a 'inch' of trouble and it blows so cold (37 deg F) that you have to run it on low.
With 86k, there will be some things that need to be done, such as motor mounts, the internal air filters, and other misc items. But if you're handy, you can do those things yourself. If the car has supporting documentation of adequate service, then you can rest a bit.
But I would have it checked out to review the obvious items but also the engine/body/climate codes with a scanner. If clear, then go for it!