Well, I guess I've got to put my two cents in here. First, the Guitar Center MC-012 mics come in two versions. One version comes with one capsule (cardioid), AND the -10db pad. They also sell the version with 3 capsules and the pad. I paid $150 each for the base model, loved them, but decided to trade them for the multiple capsule version. They were $200 each, I paid the $50 per mic extra, traded, and off I went. They did not give me a hard time about trading them in and did not mention anything about not accepting microphone returns. I have only used the new ones one time, they sound great to me, but I admit I have not done a detailed, "scientific" test to make sure they sound the same. If they don't, I will return one or both and try one or two more until I get what I want. I personally would not pay the Soundroom $660 for what I can buy from GC for $400. Assuming you can return mics that you are not happy with, I would not pay the extra. The difference is too great. I prefer to do my own QC and save $260. Fifty or $100 bucks, maybe, but not $260. Also, the GC versions I have do not say MC-012a, just MC-012. I promise this weekend, I will do as good a test as I know how to do and I will post by observations. Also, I am getting ready to order 2 Marshall 603s from Abe's, so I'll be comparing these as well. Isn't this fun??