DD has great products. I have a 12 Lite on a 16" middy, and their Omega 7.0 on a 16" carbine. I have a Samson rail on my Sig556; for one thing, it is so much better than the stock plastic crap that it has improved the rifle far beyond what it was. Also, the top rail runs the length of the receiver, with is a nice feature. Some people complained about the "SSSSS"-looking design of the cutouts, but I would not have noticed or called it that had it not been mentioned.
Madness is like gravity; all it needs is a little push.