When the Virtuoso Preciso is working, it produces a fine, consistent grind for espresso, using my Rancilio Silvia.
Setting up the machine, I did find the calibration process annoying. Baratza basically expects that you will remove the case, and adjust a screw. Not the hardest thing in the world, but also not the easiest - and it takes some time. Some of you are probably handier than I, but I don't enjoy opening up machines and mucking around.
The biggest problem is that the machine broke down multiple times. First, the adjustment ring base gradually came unglued. As this happened, I had to keep dialing in a finer and finer grind. Eventually, even on the finest grind setting, calibrated to the finest setting, shots lasted less than 10 seconds. With help from CoffeeGeek members, I sorted out the problem and glued the ring down. The machine worked again for about 3 weeks.
Then the grind deteriorated again. I thought perhaps the base had come unglued, but when I opened it up, the plastic tabs holding the adjustment ring to the base had someone gotten torn off / broken. Grinders take a lot of wear and tear, and I don't think it's a good idea to make those parts out of plastic. True to their reputation for excellent customer service, Baratza sent another adjustment ring in the mail. I got that installed.
Once reassembled, the machine would only grind for 1 second with beans in the hopper. Then it stopped. I unclogged the machine. I opened it up and checked the electrical system. Nothing worked. I called Baratza to problem-solve and their representative suggested something might be wrong with the motor.
They offered to replace the Virtuoso Preciso, but after giving it some thought, I requested that they allow me to send them $150 for an upgrade to the Baratza Vario - a produce with much more positive reviews. So far the Vario has been working well. I will post a review once enough time has passed.
I would recommend avoiding the Virtuoso Preciso for now. Baratza is a solid company, with good products (generally) and good customer service. But I think this product needs some more time / research / development. I may just have gotten a bad grinder, but I wasted FAR too much time mucking around.