I've had had nothing but bad luck with them. Dave @ Hical seems to feel that the norm is reliable mags so I've decided (against my gut feeling) to do an exchange and try again. He says they're tweaking them so we'll see. Here is the range report I posted a little while ago.
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I went out there with:
1x Ruger BX-1 with CCI SV
1x Butler Creek Steel Lip 25rnd with CCI SV
2x Battledynes with CCI SV (One lubed with Eezox, the other not lubed)
2x Battledunes with Win555 (Lubed, one with CanTire silicon spray, the other G96)
Here is how the session went (in order)
a. I began the session by firing off the BX-1 and Butler Creek mags (rapid fire bursts). Flawless.
b. I fired 100 rounds of Win555 through one of the Battledynes. No love. 40% failure rate. Had the same experience bowzy described HERE.
c. I fired the contents of the 3 remaining Battledynes. Exact same performance and failure rate (35-45%).
d. Boresnaked the barrel.
e. Tested the BX-1 and BC mags again, this time with Win555, flawless (BC was full sustained rapid fire, all 25 rounds).
f. Ran another 100 rounds of Win555 through the original Battledyne (now total round count through this mag is 200), same failure rate (40%).
g. Finished the session by again testing the Ruger and BC mags with Win555, again flawless performance.