I have been very pleased with my Aragon Stage One pre-pro. Rarely, I will have to unplug the unit for 5 minutes to reset the computer when test tones do not come up properly. Other than that issue, it has been great. Two channel is absolutely silent, setting channel levels is by .5 dB, distances are in inches, the tuner is decent but not perfect, I like the different modes to play around with, but don't use them much. I bought mine for $2500 and felt that was fair for a never-used amp (the dealer was going out of business). There is plenty of competition in the MSRP $4000 range. Hope this helps. Good luck!