DNC-520 mic arrived yesterday. I did try it late last night but nobody on the radio to talk to.
I ended up talking to myself. I put a 300 watt dummy load on the Anytone and tried the factory AT and DNC-520 mics. I was using a Grant XL as a bench radio to monitor.
DNC-520 does sound better but I still get an occasional pffff sound but much less so than on the stock AT mic. I held a piece of paper towel on front of the 520 mic and the occasional pfff went away and everything sounded great.
Paper towel on factory AT mic and pfff still there. I'll try some foam, etc, and see how that does.
As others have said the channel up/down buttons on 520 mic doesn't work on the Anytone. The "down" button makes the channels go Up. The "up" button does nothing. Not an issue.
The 520 mic is a little more hefty and solid feeling than the wimpy AT stock mic...but not by much.