I have a rolling thunder and carabiner setup and it is just absolutely painful for grip work. I love it. I am finding out that my left hand is substantially weaker with the RT. Which is weird since all the other grip stuff I do both hands are pretty close. The other thing about the RT is that if you have big ole mitts I think it is easier.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin