Finally got this today, and so far have been pleasantly surprised.
It came in the same little plastic hard case as the vism sight I bought, which is a nice touch I think, along with a picatinny mount, a universal(ish) mounting plate, a plethora of different mounting screws and a trio of allen keys.
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It fits in the fnx mounting space but I'll need to make a plate to go in the gap between the slide and sight because of the little tabs.
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It co-witnesses well with the open sights, and past 15 feet the parralax error is negligible, getting better with distance. Not more than about 15mm at 15 feet.
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It has 5 brightness settings and is somewhat brighter IRL than it appears here (it's a bit bright out here) Dot is very crisp, even without my glasses on when most other dot sights look like smeary shit.
Don't all rush out and buy one because I need to put this through its paces in a skirmish, but so far so good. Maybe it's a different supplier to the one that @rocketdogbert used, maybe their qc got better, or maybe I just got lucky. Caveat Emptor and all that.
Have to say I think it looks the business though, very Modern Warfare. So if you just want the look and are not really a person that *uses* sights them I suppose you can't go wrong.