New here, have a question

Some of you may know me from 1911forum.com. I finally decided I HAD to have at least one Luger. Since I don't have it in my possession yet all I can tell you is that it's a 1940 date Mauser, and appears to be original and matching except for the mag. I'll post more about it once I receive it. In the meantime, the question I have relates to aftermarket mags for shooter duty. Are the Mec-Gar any good? At the local show I also found some made-in-Holland stamped steel ones (plastic base) that looked to be made well. I also found one original WW2 mag which I picked up today in advance of receiving the pistol. I am just curious if the aftermarket ones work or if the originals are the only ones worth bringing home. TIA