What you think of them, do they perform well?

I bought 6 a few weeks ago, just to get some mags. I also picked up an AR kit too and was thinking of getting more mags, but the pricier ones but Idk those cheap ones have lots of good reviews.

haven't had a problem with them.  works well for me.

primary arms.com has troy 30rd mags for 6.99 now

More from Young Guns.

I believe D&H USGI mags are supposed to be good quality.  I have a bunch, but haven't tested any out yet.  $6.99 is a GREAT price.  I think I bought last at $8.99 per mag.  I haven't busted any of these out to test/try as I have a bunch of others that are currently in the rotation.  I will likely bust out 2 to try and test soon, though I expect them to work flawlessly.

I have a bunch of different mags, but my preference is USGI.  I have PMag and those hybrid Lancer mags.  All have worked great.  The only AR mags that I avoid are ProMag.

D&H used to be Labelle which has a good reputation.   Metal AR mags are at good prices now

primary arms.com has troy 30rd mags for 6.99 now

After PA switched to their new shopping cart, can't order AR mags for HI.  Used to be able to but should contact them first about getting mags shipped.
Believe 44 mag also changed policy with no HI

D&H used to be Labelle which has a good reputation.   Metal AR mags are at good prices now

Yup!    I have a bunch of Labelle mags as well as from other USGI manufacturers that I had on a "trusted" mfr list.  I recall that NHMTG, Center, Colt and Brownells were all GTG with Labelle/D&H.  I just haven't used any of the D&H manufactured ones, but I expect them to be good quality. 

After PA switched to their new shopping cart, can't order AR mags for HI.  Used to be able to but should contact them first about getting mags shipped.
Believe 44 mag also changed policy with no HI

I used to buy from 44 mag, but they switch their shipping policy a while back.  I have since found other suppliers.  Just depends on what mags you want.  44 mag used to have pretty much any mags that I wanted.  Now I have to shop around for AR mags one site, AK mags another site, polymer mags another site, etc.