Some things to keep in mind:
- Your double may well differ from that of another user by a fair margin
- g/sec...fraught with danger as grind setting is the biggest influence. As such, unless you're dosing x grams into the same basket, used with the same machine to produce an identical pour rate, we're probably all wasting time...
FWIW, on our gear I am currently using nakeds/triples a heap. The M4D kicks the Mazzer, K3P and M2M for speed. It's also quicker than a SJ-E. My gut tells me that it (M4D) may well be a little quicker than the Fausto as well. I do like the Fausto though and one has displaced my M2M as a backup to my old faithful Kony-E at home. E5OD is due this week and we'll be cracking a box open to see how it shapes up in the wild.