when you can have the same functionality for $80?
Sorry Leo, IMHO, anything that flips, moves, turns, etc. is a problem waiting to happen. The Horusvision one has been in actual duty/use for quite some time. I have been using mine for all of 2 matches and I already like it, just this last Saturday at DIFTA, I was being tricked by a slanted tree to cant my gun, missed once, then noticed my level, hit it the second time around.
Horusvision's Level is simple and visible from the shooting position with your off-sight eye (I mount the device with the level UNDER the inclinometer).
Inclinometer is magnetically dampened and will settle down well and fast.
Mounts are tough as nails.
You do not really need an inclinometer to read to each 10°, what you need is something to tell you if you are within 20° of level, between 20° and 35° of level, or between 35° and 50° of level. Or at least those are the "bands" that seem to work for me.
I do not think of myself as a "tightwad", but I do not see any reason to spend more money on a weaker link. Reliability, consistency and coherency are the most important attributes to ME.