HarveyMushman I have the larger predecessor to the Aergrind, the Feldgrind. But the Feldgrind is the hand grinder I use most, just because of the feel, fit & finish (the Aergrind lid looks a little more Heath-Robbo than the Feld though). I can’t open beer bottles with the Feld crank handle, which you can reportedly do with the Aergrind :-)
I like that I can check/adjust the stepless, grind setting without unscrewing the catch cup & counting clicks (like on the Comandante), also I’ve never had the Feld catch cup drop off mid grind.
The Comandante X25 has less grind resistance whilst grinding, but takes a little longer.
Overall, the Aergrind would be my choice, especially if just for occasional travel.