I'm ready to buy my next group of mags, and so far I only have PMAGS.  The search function returns nothing on Troy Battlemags, and I have read only a few references to the Okay Surefeeds.  

1) What is the difference between Okay's Surefeeds and their E-mags?  The Emags are about $1 more.
2) How do the Battlemags compare to the PMags?  I can find the Troys cheaper than the Gen2 and Gen3 PMags, and at about the same price as the Surefeeds.

I've had several Troy battlemags I bought post Sandy hook, the ones I kept work perfectly and I gave away a few over the years to new AR owners. They always worked fine but I never really felt a desire to buy more over Lancers or GI aluminum/pmags.

Surefeeds are GTG mispec metal mags.

The E2 surefeeds have textured mag bodies and different follower.  Its their top of the line mag..

I keep Surefeeds, Lancers and Pmags...

I had some issues with troy mags not feeding softpoints. I don't use them anymore.

Gen 3 MCT pmags are $10.50 each at provenoutfitters.com. That's what I recommend.

I've ordered some of the E2's to play with, but I don't have them in hand yet.

E2 "improvements "

Original Surefeeds are golden.

As for the Troy mags, buy a couple and run them then you will know firsthand. Pure trash IME.

Pmags while not my flavor are solid kit. M3 > M2.