James Tanner uses them, hopefully he will chime in. I plan to get a pair of the single Rack of Silence models for my 28's a bit down the road. The new Hybrid racks look interesting as well. Looks like with them we'll finally be able to go over 4 shelves as they are stackable with 3 post sizes to choose from. That's the one downside I see with the Rack of Silence models, they don't go any higher than 4 shelves.