I've found Spyderco's and Byrd's (a less expensive subsidiary of Spyderco) to be equally as easy to use right or left handed.
Yes, there are plenty of fine choices out there.
I'm sure the mini-Grips are fine knives too. But just in this short thread I see there are a couple of people who have had trouble with them. So the problems can't be that rare if they've been seen more than once in such a small sample of people.
After hanging out on knifeforums for a while, it was my impression that it is fairly rare, but YMMV.
-john