Considering the tight tolerances MF seems to have (I think that's a good thing, usually, as it compliments design and QC, most of the time), the one, tiny nit-pick I can find thus far is with a finishing grinder. The one I received is a little too big for it to fit into the LB's bowl: bottom lip of the finishing grinder doesn't fit into the bowl without a lot of force. It's supposed to, right? It's doubly difficult to get it out and almost requires tools. I forced it once and I won't do it again... It grinds great, it just doesn't fit into either of the two LBs that I have (one used, one new and unused; I'm in a dry climate).
It shouldn't take much sanding to get it to fit (e.g. I'm not crying a river here!), I'm just curious to know if I'm alone.
On a side note, I experience the shoulder-hump build up as well, even with very dry herb. A proper cleaning and burn off seem to help. I also--very gently--use a pipe cleaner to swab up (did I mentioned gently?) some of the accumulation under the screen. Gently. Don't poke the little light, or break the tiny, tiny, tiny wires to the bulb!