I used several other grinders in the past andI thought they were pretty good. I use the S&B Venty, but had used the Mighty for several years before that. After some research, I found that grind the Santa Cruz Shredder grinders produce are the best for my dry vape devices. That led to me buying the large Rasta four piece. What a difference. I could feel the quality as soon as I removed it from the box. The magnet for the lid is heavy with a strong magnetic attachment to the grinder. Grinding is almost effortless and smoother than any other grinder I’ve ever used. The grinds are always uniform and the same size. This led to me buying the jumbo size Rasta. Fast forward to the present and I just picked up the blue and the purple in large. Yes, I own three large four piece grinders and one jumbo. Here are some tips. My first use of the purple grinder reminded me how smooth and effortless these are to operate. My Rasta large was kind of tough to operate lately and the grinds were not consistent and uniform. Half hour in alcohol did the trick. It just needed cleaned and it is now back to operating like the day I bought it. Another tip, they sell grease. I'd say it's worth using. It makes the action even smoother than brand new. These grinders are beautiful, high quality, and work great. I recommend these grinders to everyone in real life.