I haven't tried one. I've never even seen one before, but it looks .. interesting. I'll will say that although I don't see a tremendous amount of need for it in the market, I like that it exists if only to provide shooters with personalized mounting options. In this case however, I don't really see it as being very practical. I just don't see any purpose for the long middle section of rail between sighting areas. At least not enough point to justify the added weight and bulk. A holo-sight setup or something of that nature sits and aims very well on a standard rail which most shotguns are already drilled and tapped for ( and which costs $10-20 ) And all the rail accessories you could ever want would best be strapped on to a shotgun on the handguard, or so I believe anyway. If it's the AR type sights that interest you, than I'd think a set of ghost ring sights would be far more simple, logical, and would provide a better sight picture for a shotgun. The rail sits too high, and just makes too much extra bulk for just sights. I'd just say to anyone who was considering this part, that if you want sights instead of a bead on your shotty, then choose installing ghost rings or mounting a holosight. The only possible thing I can see this long rail would do, is maybe let you set up a co-witness...
I don't normally keep a holosight device on the shotgun, but I popped on the XPS2-0 just to show you how it would sit on a standard rail that cost less than 20 bucks to add on. Sorry about pic quality , took it with my phone. Especially for a shotgun, at any reasonable range there isn't any reason to have it mounted further down the barrel. As you can see this 590 also has the ERGO rails, which I cant say enough good things about, to strap the tacticool crap on
Mind you, the handguard rail system AND standard pic rail together still costs around half what that minotaur tactical part would. Most of all though I keep looking at and thinking, "What do you do with the middle ?"