I have a cousin that called me up yesterday. Her and her hubby are looking at a '99 ML 320 with 37k on it for $21k. They know I'm the token family Mercedes "expert" ( ) so they called me up to ask if they should buy it.
I don't know squat about the ML model. I perused this forum and don't see any major repetitive issues. So I'll throw this out to you guys. Anything they should be aware of? They're used to Hondas and Toyotas with their dependability. My cousins hubby is not any kind of mechanic, so they'll just end up making a shop very rich if this thing turns into a lemon.

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)