There seems to be a slight (?) difference in specs between Amazon (states 20 M ions) and Aliexpress (states 10M ions)
The one I bought also states 20M ions but I can’t feel them on my lips as Dave describes. It does seem to work quite well though.
Big range of prices on Amazon UK for what seem to be very similar devices.
Lelit Elizabeth (2) , Eureka Oro Mignon Single Dose, Mignon Mk2 (converted to single dose), Aerolatte Mini grinders(2), cafetières, Bodum K1218 Vacuum