Is yours one of the newest versions with the Aux-in jack? If so, I think the noise issues should be significantly improved from what I am reading. I had one of the original ones (without aux-in) and it was not too noisy for me, but did have more noticeable noise floor than the original AO (apparently due to the original AOU graphic EQ topology) and the signal-to-noise ratio of the digital circuitry in the cab-sim was too much for some people (again, I found it acceptable but definitely less adjustment headroom to counter noise floor than my X-Ultra). It sounds like the cab-sim issue is definitely resolved (it is supposed to now have the same circuit as the XU which works well for me), and I assume the EQ issue has also been resolved as the identical EQ on my XU is also silent (this I don't have verification of though).
I enjoy my X-Ultra but actually preferred the AOU as a dirty preamp and have been considering going back to one (I sold the AOU for $$$ to buy the XU). Great pedal!
Curious if you can elaborate on why you dig the AOU over the XU - just personal preference in the dirt character?
I've gone through the AO > X7 > AOU (currently). I miss some of the emphasized/compressed punch that the X unit had, but I think I like the dirt character of the AO pedals more. I especially like being able to combine them. Still, I've been kicking around the idea of selling my AOU for an XU.