Who Dunnit is a total dog, IMO.
When you get tired of it, which you will, you will be begging people to buy it.
I'm sure I could say the same about pins you might like to. For instance, I can't stand TAF. I saw one on site at Gatlinburg 2 years ago, and said to my wife "this pin is pretty much the most popular pin ever, we have to play it". After playing it a few times, we both decided it sucked. I can't even get into it in Pinmame.
Apparently you missed the key points of why I want Whodunnit.
1. It is one of the better inexpensive DMD's
2. THE WIFE GAVE THE GREEN LIGHT.
#2 is pretty much a deal maker on any arcade related purchase.
The only other 2 pins she would love to have are Scared Stiff and South Park. Those are both well out of my price range, especially in the condition the Whodunnit will be in. The Whodunnit will be $1300-$1500 and is in excellent shape.
Besides, if I ever get tired of it I can always trade it back to the guy I'll be getting it off of.