Honestly Ive never actually spent any good money on a grinder usually just cheap ones from a head shop etc. I finally ended up buying a pretty expensive grinder because i had a 20$ amazon gift card.
Without a doubt my Santa Cruz Shredder was a WELL worth investment. All of the machining feels smooth, it feels nice to turn, cuts through and nugs i put in like BUTTER, and the consistency of the herb after the grind to me is perfect! It somehow takes nugs of any density and turns it into a fluffy beautiful grind, and either im high or i swear it somehow makes it taste better and smell better. Got the three piece since all i do is vape and like to keep the keif in for flavor and extra ooompf!