K2 is the most budget economic grinder out of the others and is the best budget manual coffee grinder especially at this price on the market.
K2 is more suited for cheap supermarket coffee, so if you're getting better coffee then get K4 or K6 to get you the better flavours + easier to use with the external adjustment system.
But the K2 is still a solid, real quality piece of engineering and is a well rated and reviewed grinder especially for traditional espresso or shorter pulls.
I recommend the flagship K6 over the K2 which is still on sale now @ $118.40.
But for a cheaper budget and supermarket coffee, get this.
lol. That’s not how it works.
The goal coffee snobs are seeking is precise control and replication. If you are happy with the flavours of premium priced coffee, but accept very minor variation, any grinder will do. If you are happy with the flavour of cheaper coffee, but demand consistency, then a premium grinder is necessary.