I have a power feed from Matt/QMT that I got with my mill. It's an ALSGS that looks identical to the Align powerfeeds. But the ALSGS is made in China & Align is Taiwan. Also has the brass & zytel gears.
I've had it for 5+ yrs now with no issues. Even bought a replacement zytel gear for it a while back but the original gear still looks new. My guess is they get damaged if you don't wait for the motor to spool down before reengaging or reverse direction.
I've had mine apart cause I replaced the power indicator neon bulb with a
LED. I don't remember seeing anything shoddy inside.
Oh wait, ok I lied, I did have to replace something but it was just the rubber switch cover for the rapid. Mine dried out & started cracking. I purchased replacements from the co listed above, Bestline Pro. I bought a bunch of them so I'll be good for a long time as long as the power feed doesn't quit on me. And if it does I'll be happy to purchase another from Matt.