I've been using D&H mags in my ARs for a few years and with all the madness going on these days (getting better) I figured I'd do a review of what I've found so far.
-Standard USGI dimensions so they will work in any rifle that accepts USGI mags
-I've never had a malfunction related to these mags; they've been as reliable as any mag I've ever used
-6061-T6 aluminum body. Some models are teflon coated for smoother feeding
-All of mine have Magpul anti-tilt followers but even the standard D&H mags feature an anti-tilt follower
-Price. Pre-madness these were going for around $10 a mag if you watched out for the deals. These days they seem to range from $11-15
-Available in many different colors to match your rifle's color scheme
-The only one I can think of is a con that I'd list for any USGI type magazine---they are more prone to denting and feed lip damage than their polymer competitors.
All in all these are great mags and are some of the best USGI type mags on the market.