Ah given this thread has re-surfaced...
Comparing the ResQMe to the CRKT Exitool, the ResQMe is easier to use in a car because you don't have to swing it at the window.
The belt cutters on both work, though the ResQMe is marginally better.
In terms of ease of use, these work well and are easy to use without thinking. A decent knife blade works well but requires a bit more thought. The strap cutter on the OHT is OK, doesn't work as well as a knife/ResQMe but is easier to use without thinking than the knife. The strap cutter on the MUT is crap and just doesn't work for cutting a seatbelt. You'd be better off with a Squirt.
All tests done at the UK Meet using seatbelt provided by Gareth.