I am at 108:1 in low/low. There have been several times on down hills that I wish I was slower, finding myself using the brakes. I am adding a 4.7:1 case in the back of my setup. Should be put me in the 180:1 range.
I don't run mud much, I mostly run on the rocks and tight trails. The gearing works good for me. I could not imagine not having crawler gears.