They're good, but the finish is more likely to flake in my experience than some other brands. Especially around the holes for the triggerguard and bolt catch. They've gotten better in the last two years though.
I don't like most any of the billet ones because of the extra cost involved. There isn't enough benefit, for me, to want to spend the money on them. Most do look hella cool, but not cool enough for me to spend the extra on.
I'd much rather get an Aero than most other brands that are $20-40 higher with no real benefit, and even if the finish is a little better, I can live with it. Especially since I'll likely get scratches and dings in it anyway.
For a beater or a user, they are fine. For a presentation rifle for a retirement gift or something, maybe a nicer looking one for sure.