I've had mine since early '06, so this is outside your sample, but:
Peppersass wrote:1. Does the grinder produce consistent high-quality output over days, weeks, months of use?
Peppersass wrote:2. Does the grind setting slip?
No, it actually requires less adjustment than the mazzer roburs I've used, probably because there's so much less heat.
Peppersass wrote:3. Does the drive belt slip?
Yes, even when recently cleaned with acetone. I bought the "knurled pulley", but it made very little difference. I don't use unusual beans; i regularly alternate between Stumptown, Ecco, Ritual, and whatever else strikes my fancy at Barista- the belt slips on any of them. I feed beans slowly, but its still an issue. When I finish my pump project I might look into timing pulleys & belt (a sim. solution to what Mark at Synesso has in his shop.)
Peppersass wrote:4. Have you observed burr misalignment?
Peppersass wrote:5. Have you observed runout in excess of spec on the drive shaft?
I've never put machinist tools to it, but you can see very slight eccentricity. I see no impact on performance, though.
Peppersass wrote:6. Are there any other design or mechanical flaws of which I should be aware?
I've blown a fuse on it once when feeding unusual beans, but its an easy fix (with spares included with the grinder) & they're easy to source for replacement.