We aren't gonna get into a grinder discussion here, but 1-most vapes don't care what grinder you use, and this is one of those. 2-I like a 2 piece grinder unless the bud is really dry (shedding kief easily, making kief collection via a 4 piece almost necessary to avoid losing it). You don't have to pay out the ass to get a good grinder, despite what the SCS and SC fans will tell you. I've used a shitload of grinders over the years, and an under $20 Chromium/Sharp/whatever crusher works as well and lasts as long as the pricy brands for me. The nice thing about a 2 piece is that you can buy that high end brand and still not pay a lot, especially if you stay around 2" in size. Different story for a 4 piece and I just won't pay those inflated prices just so I can get a grinder with no burrs on it.
This is a really good buy. I've used one for years and the anodizing is absolutely top rate-looks as good as when I bought it. The
4 piece version is also a great buy and has a removable screen- a really hard to find feature. You can check the herb grinders thread for advice if you want, but these days it's mostly an SCS fan club. Feel free to PM me as well, but let's stay on the FM topic here.
If you have 4 edges (unlike the Mendo), you CAN get a fine grind, but with a 2 piece, how long you grind is the key. With a 4 piece your consistency is determined by the number of teeth and the hole size.
only a shitload of knockoffs and pens . good thing I found FC orelse i would have never found such a good vape! 
