Hey, glad you asked. I have gone to the range twice with the Speedot 135 now. It's mounted with an ARMS #5 on a bushmaster M4 Patrolmans carbine with the front sight post left on (reason for the elevating arms mount), and no flash supressor.
So far I am very happy with it. Variable brightness is very nice, wide range of dot sizeswide range of brightness, not size, lol...oops. the 35 MM rings included locked on to the arms mount with no effort, and it seems to be a nice tight setup. The finish is actually all black, and the sight looks great, if you ask me. There is also a 1" extension tube that screws nicely on the front for additional glare reduction.
So far, the accuracy has been very good. Sighting acquisition is effortless, with eye relief being a non issue for me. The dot is small, but not too small. Most of my work so far has been at 50 yards, where it has improved my groups slightly over irons.
The last shot I took was at a empty XM193 20 rd box filled up with empty brass and the plastic holder, then taped and laid down on its top so only the smallest end was visible at 50 yards. 1 shot, and I hit it basically dead on, scattering brass all over. Could only find 5 or 6 mangled ones. The sight is lots of fun, and so far so good with repeat zero.
You'll have to put your own ovservations in here, too.