Well, it's extremely cool having the extra mounting space and the option to have none at all. But the lack of being able to cowitness almost anything sucks. So, if you don't care to cowitness and just slap an AP with QD rail incase it flaws so you can still use your irons quickly, then you're g2g.
I give it a good 8/10. There are better rails, but this one is awesome.