I have a question with regards to purchasing mining amps. Obviously they are crafted and what is even more obvious is that they have mark up. My question is two part but I will begin with this. Do you lose value when purchasing say for example half TT amps + MU vs purchasing a fully TT amp + MU? Secondly what kind of effect does efficiency have on mining? I find it difficult understanding the difference between level 2's and terra amps, which I should buy or at what price and what time if MU's change.