not the montanas, and perhaps I'd think on all lugged offset traps- the levers come up just as high on the offset as the non offset.
the only advantages I see in offsets are 2:
1) public perception
2) I was told, and paid close attention to this the past couple of years and agree- that offsets give you more success with a canine caught by a toe or two. The thought is that the offset lets the toe slide (under the joint in a trap), where a reg jaw can allow the toes to break, allowing escape and 1 toe left in the trap.
Offsets do indeed cure this problem.
I've never believed offsets are more "comfortable".
On coon- if using a bigger trap and taking coon as incidentals or in water sets (drowning) offsets are no problem because of the higher catch. With smaller traps (ie 1.5) offsets will indeed give you a lot of missed coon.