I just put a pair on the back of my S10 a couple weeks ago. Only been out twice but they are a shit ton better than the Competition Engineering 3 ways I had. Super nice people to work with. I just picked up a fox body project and i'll more than likely go with ViKing again.
I started using Viking coilovers on my 71 Nova this year and am very pleased with them. I had custom valved Bilsteins for corner stuff and Comp Eng 3 ways for drags. These are a huge improvement. The biggest benefit is dialing them way off and cruising down the freeway like a Cadillac.