I started out with 60 qt mixers and put them in my first 3 shops. I opened a commissary in the back of shop 4 and went with a VCM. I would take the Pepsi challenge any day with either of them, and bet you couldn’t find a difference. With my mixers we did a 8 minute mix at the slowest speed, and that translated to a 90 second mix in the VCM. I always had the idea that the faster speeds on the mixer would make the engine burn out faster, and that is the only reason we used the slowest speed (could be completely unfounded there though, is that the case Tom or George?).
We used the same pre-mixing operations with both. 8 Minutes of yeast hydration (sugar, water and yeast) then added to 12 Kg of flour mixed slightly with the salt in the mixer/VCM. We added oil at the 6 minute point with the mixer, and at about the 30 second mark with the VCM. Basically at the point when the flour was wet enough not to be encapsulated with oil.
I haven’t heard of a gra-lab timer, but I have never seen a VCM without an automatic timer attached, and couldn’t recommend one at all. I could probably eyeball either of them, but wouldn’t want to. No reason to take the chance on over or under mixed dough.
@Pirate - Tough dough, as was mentioned is usually just a sign of over mixing, and in a VCM, even a few seconds is really has a large impact on your dough.