I have the "sister gun" to that the IM6500HP.
Good impact but it is an air hog meaning you need to have teh cfm's to meet its needs, but it is quite capable of daily use for any and all needs.
Had a buddy run up seat bolts on his SUV with it and he got carried away and pulled one of the welded seat studs all of the way thru his floor pan with it.
It now plays back up to my MG725, but if the gun is in good shape $100 is fair, esepeically with low use or if rebuilt recently. I'd hope to get somewhere between $150 to $200 if I sold off my IM6500.