FWIW - when I was about to buy my first regulator set, I was gravitating to the Scubapro MK25/700A. Then I saw a movie about diving under the Antarctic ice in -20*C on the surface. These divers used Apeks XTX50. Hence I bought an Apeks XTX100+40 and never regretted it. But then, I have never tried a Scubapro. Had I bought it, I'm sure, I would not regret it either. The suffering of choosing lasts until you buy a good reg. After that, you even don't think about it.