Thanks Phil, but I don't need it for two reasons. First, I'm not sure my JVC would benefit from it, as it features a very good built in headphone amp and doesn't have a lineout (I didn't notice improvements in sound quality when I amped my Kenwood HD10GB7 either, apart from the useful bass boost featured by the Supermacro LE). Second, 'cuz the Govibe 7 would be too big for me to carry around. I have a little amp (iBasso T2) I toy with, but it's all.
I might get a Supermicro one day, but currently Xin's lack of warranty (due to the extra long wait times) and known problems with loose jacks (which I've also stepped in) keep me at a reasonable distance from it.
Last option might be a Pico, nothing short of it.