Therrin, Shags
So far I am really happy with the springs, although the only benefit I have gotten from them so far is to be say " hey look at the new airbags on my truck"
I havent really tested them yet, they do make the ride quite harsh though if you have too much pressure in them without a load. I'll probably be filling the truck up with wet oak and madrone this weekend so I'll get to see how much they really help.