This being said, I recently ordered a Tomo V8-4 from Tomo and I got it last Wednesday, about 10-12 days after ordering it off their website.
Not nearly as sophisticated, nor evidently as efficient as the YZX PB, but it works well and it's easier to swap in fresh batteries than with my Ruinovo (or my Xiaomi Mi--fixed,) or the YZX.
I also think the Tomo is fine if you use another charger and put in fresh batteries, since it chargers the batteries inside painfully slowly. And always use four of them. Mine overheats if I use only one 18650 and charge anything else faster than 0.5 amps.