The biggest knock against MT is their price (and their ad's). You got it for free! I see no problems.
Honestly, I'm on my 2nd bottle of a Leukic clone by AllMax if I remember correctly. I'm also megadosing BCAA's, and seeing some of the best changes I've seen in a long time. (Still taking other supps, but this was the biggest change I think).
I've megadosed BCAA's before, and they haven't had as great effect as they do now...I'm guessing it's the Leukic.
Gakic - I actually bought the MT version of that in powder form. Still have a container over half full. For some reason, the taste makes me nausous, as well as the actual product. I just can't stand it for some reason. Works for others I've heard, but not me...
None of those should "mess you up", unless you consider the nausea from Gakic that I got... Leukic is basically the BCAA Leucine with an added absorbtion ingredient.