I used a Solis Maestro for about a year and a half, 5 days a week grinding enough for 1 pot. It started having problems feeding/grinding so I dismantled it, cleaned and sharpened the burrs as best I could a couple of times during the last 2 months - eventually giving up on it.
It did a wonderful job! But for the price I think it should have lasted longer.
I now use my Rancilio Rocky espresso grinder on it's coarsest setting and that too does a great job.