Well I suppose at about $60, we could call the Kannastor Gr8tr v2 "middle class." ?
for 60 euro/dollar you can buy a top class 4 parts spacecase grinder. And they are considered the top class grinder that many other grinder brands try to copy. so 60 euro should not be a middle class grinder. it should be top class.
But any grinder can grind herbs even the one you buy for 2 dollars. but the "expensive" ones are anodized which means it is anti-scratch, anti-stick, anti "i wanna get vaked and my grinder wont open anymore", anti "micro pieces of airplane or plastic mixed with my herbs".
that is what they call grinders like that medical grade. i have no experience with the gr8tr, but it looks like
they copied a "lift" grinder, so probably should work pretty gr8.