Seems to do job just ok. Have used a few times, and the ground drill faces are not quite right. A bit concerned at the dril flute guides which seem to be plastic. These are important to function. I had a bosch one with metal guides, (sort you attach to a drill to spin grinding wheel, it was almost impossible to use but it did a better grinding job.)For convenience, this one is easy to work and use, but not convinced of the accuracy of face grinding, and flute guides.

Picked one up a day ago, sharpened a dozen or so bits from 3 mm to 12mm. It did the job well, which is what I was after as a DIY'er. All bits were tested before and after, as there's been a few negative reviews. First, it doesn't do speciality bits, just your basic wood and metal bits. Second, it doesn't have an adjustable grind angle. Third, and this is important...it's difficult to judge when the grind face is in contact with the bit, but I found that if you place the bit in the machine, turn it on, then raise the grind stone it works perfectly as you will here and feel it. For the cost, it paid for itself by saving me replacing the dozen bits I sharpened initially.

Not sure if mine is faulty but after sharpening two drills it just dose nothing