Bad. It's VERY high. Even with the good cheek riser it's just very tall. Night vision is an inch or three higher than that, close to unusable IME. SLOW as it's clunky, everything moves around, you don't have good contact, and what you have is unnatural, so very odd head position, gets tiring after a bit, and jeesh, prone? Only if you like feeling like a prairie dog scout.
The gooseneck that hovers the RDS over the handguard (better, the Elbit Falcon setup, bolted to the barrel and goes through the vent holes!) worked well, as long as you aren't one who is confused by cowitnessing, so can just ignore the irons and use the dot alone. The Aimpoint-provided gooseneck sometimes doesn't hold zero well, so that's not great. And a friend way back when had the... I forget what it's called, but you sent the upper off, a guy cut the carry handle off and glued (!) a Weaver (not Picatinny!) rail on top of the receiver. Rear sight stayed in place. Clamp an Aimpoint Comp to the rail. Solid, slick cowitness.
Since I could get scopes low mounted on the FAL and AR-18, it's once reason I didn't own an AR-15 myself, at all, until the mid-2000s when flat tops became so common and everyone figured out you could free-float them (the AR-15 /evolved/ to be this flexible. It wasn't born that way). THEN they all became much more viable.
So back more or less on topic: Except for some odd and more expensive guns, if I wanted to hit things reliably, I'd do an AR-10/SR-25/etc because it is easy to get floated (or monolithic) and flat topped. Dress as needed for the occasion then.