I have purchased a LOT of magazines from CDNN (going back to when they were called CDNN Investments and advertised in Shotgun News - pre-Web). I have only had one bad one - that being a dodgy M14/M1A after marked monstrosity. I just received 3 Met-Gars for my CZ75 compact (range test this afternoon I hope) and a bunch of Metal Form 1911 mags.
As to CDNN's descriptions... some years ago I was interested in some 1911 mags which were described as Metal Form but which were not so marked. They gave me a contact at Metal Form. After he returned from a hunting trip in Europe he go back to me. Apparently the big magazine manufacturers make the same mags marked with customer names (e.g. Colt), their own names and no names - for different markets.
For 20 bucks - might be worth a try. CDNN has a #4.99 shipping promo going on at the moment. The trouble which I have with CDNN is that I always find more stuff to put on my order

Ken