I just posted this on the Mooer thread, not sure if I should link to it or copy / paste:
well, I took one for the team and ordered a Mooer Pure Octave from Amazon. $88 shipped. Will be returning as soon as I can get to the post office, it's completely unusable for octave up IMO. Can't imagine it being any better on guitar, but I'll let someone else try that...
For reference, I've found most pitch shifter devices sound like crap for octave up; exceptions that I've tried are the Line 6M9 (so I assume the M5 is also good), the Eventide Pitch Factor, and the original V-Bass. Yeah, all of these cost way more than the Mooer, but they also do many more functions. I was hoping that Mooer had figured out how to do the simple octave up / down at low cost and more importantly in a small box / using 9V power supply.
Here's my review from Amazon:
I was tempted to give two stars because the form factor and overall quality feel - nice switches, looks / feels very well made. But, the sound quality is so bad that I could not do it. I bought this for doing octave up pitch shifting, as I've got the octave down (traditional analog octaver) covered. I was playing single note lines, not expecting it to be able to track multiple notes.
The pitch shifted sound is horribly out of tune and has a wavering, warbly tonality. No way that I could use it for lead lines where I hoped for a stable, clear octave-up copy of my original sound. So, I tried mixing in just a small amount of pitch shifted sound with clean hoping that I could use it to just add a bit of brightness, but the sound is so out of tune that even in really small doses it was driving me crazy. I can't believe that Mooer put this pedal on the market, definitely does not give me confidence in their other products.