I run a vortex strikefire on mine with the 3x magnifier. It works well and i am pleased with the quality but It's clunky and makes a heavy gun heavier as others have said. I can't say i'm a huge fan of the flip to side magnifier craze now that I've run it for a while. Height with the standard cantilever is fine usability wise, I've never really looked at cowitnessing it with the backup irons so cannot speak to that. I also have a burris AR 536 I've been thinking about trying, although 3x might be a better choice. the glass is very clear and it's compact, but heavy. Also no 1 x option there. eye box is tight but seems to work well on my SAR. Have not taken it to the range yet on the tavor, but have used it on other guns and really like it. I'd have to say that on a bullpup it's nice to have a 1x option though.
In my opinion, burris is underrated, affordable, and the quality is surprising. really like their MTAC line as well. I consoder them comperable to votex, or even a little better, but people don't seem to know about them as much.
If you don't want magnification andyou want to keep the weight down, the SPARC II would be a good choice and comes with a multi-height mount system
final disclaimer: I'm cheap when it comes to optics. When i get to more than 500 bucks for an optic, I start thinking about putting it toward another gun.
Hope my 2 cents helps you out