I've got about 5,000 miles on 4R 5100's and 880/906's. I think it rides great. I'm sure it could be better at smoothing out some of the bumps that I encounter but it's also a live rear axle, 16 year old truck. I don't think it's ever going to ride like a caddy without putting considerably more cash into it.
The cost for 5100's and OME springs is what, maybe $500? You can't even get a Front left Icon C/O for that.
People expecting a budget shock/spring lift to both raise the truck and ride like remote reservoir adjustable dampening fox racing shocks are expecting just a bit too much, IMHO. For what it is, it's not bad at all and it's super fun over big speed bumps around NOVA.