Asr, I truly appreciate your review of the Pico amp.
Often seen as the 'holy grail' of headphone amp, you pointed out the obvious limitations of portable amps, which most reviewer barely mentions. It might be the holy grail of PORTABLE headphone amp, together with Predator, but they still have their 'obvious' limitations. Bottom line, it's probably as good as it gets in the PORTABLE realm.
Anyone thinking of getting one should take note of that. It took me a while to get that in my head with all the glorious reviews around.