I have never tried a Lone Wolf, but have had a Summit Cobra for about 5 years now and have had no complaints. I was always one who wasn't real excited about getting up into a tree after having an incident with one of those old V-bar type climbers, but I feel very comfortable and secure in the Cobra and would probably buy another if I had a need.
That being said, I bought one of their Backpacker hang-ons and a set of Bucksteps two years ago and find I use it more often than anything. It's lighter, easier to pack, and more comfortable than the climber, and to top it off I can put it in any old scragly tree I need to, instead of having to find a straight one with no limbs.
Just for the record, I'm 6'1"/220 lbs.