Bought a fancy hand grinder last month thinking it would fix my bitter shots, but my $20 blade one does the same job for my french press. The burrs just made my beans take twice as long to grind and left chunks anyway. Anyone else fallen for the gear trap when your brew method didn't need it?
Did you check if your blade grinder is actually giving you a consistent grind for french press? Burr grinders do make a big difference for some brew methods, but french press is pretty forgiving so you might just not need the upgrade.