I'm not even going to join in the discussion of brand/make and which one is better since it is a very opinionated subject that usually ends up in a never-ending circular argument...I will say there is definitely a difference in BUIS quality between manufacturers. When I first bought my AR I did the typical noob thing and saw all this seemingly great Magpul stuff and of course, naturally, I decked out my AR with Magpul product from muzzle to buttstock. Not to knock Magpul in general but some of their products are what I consider "good trys," some of them are "ok" and some of them are in the area of "excellent" (in my most humble opinion of course). Their folding sights are in the category of "OK" in my opinion. Yes, its true, if you're looking for cheap BUIS they will do what they're advertised to do. They're plastic. It probably cost them all of $5.00 to manufacture each one of those sights (parts, labor). If you need inexpensive BUIS then Magpul is the way to go. If you're looking for something more refined, well-made and durable go with something like the Troy products, Samson or BCM. I'm sort of from the old school and think EVERYONE should be forced to learn marksmanship first on the old carry handle iron sights with fixed front. There is no other setup I can think of that teaches fundamentals like that one (strictly speaking of the AR15/M4 family of rifles). Anyway, thats my two cents for what its worth.