i think it's a good idea . . . if it turns up something, you can use that to bargain or walk away . . . if it doesn't turn up anything, you have added peace of mind, plus you can save it and use it if you ever want to sell it someone else

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman