while i wasn't too impressed with the HK "high reliability" magazines as they worked fine in my personal experience but the weight was meh and they didn't play nice with tracers. i preferred (and used) mostly Adventure Line and Okay with the magpul follower or the Colt and Sendra's with the dark green follower. the black follower was "okay" but had issues sometimes. i prefer mostly the C-Products Stainless Steel mags these days but still like the Lancers, 2nd gen Magpuls, the magpul "E-Mag", the 1st gen Thermolds (with the maple leaf on it), and the Orlite mags. E-landers and gen 1 magpuls are meh imho. Hex mag too. not impressed with the 2nd Amend mags (shame), and the US made Thermolds were garbage along the same vibe as Promag.
for someone wanting cost reduced mags that are still good, ASC, magpul, and D&H are hard to beat. ETS were kinda fragile imho.