I have to say that I have been using the HF DA grinder for at least 3-4 years. Yes, it took a lot longer than a $29 grinder should have. I felt like an upgrade was waiting for me. I read all the reviews and bought this one. All I can say is why didn't I switch sooner? This grinder is much smoother, much less vibration and much quieter than the HF model. It's really like day and night. It feels and works like a precision instrument. In the 20-30 hours I spent on this grinder, it never missed a beat. The low vibration and noise levels are worth the price in and of themselves. Cannot recommend this tool enough. I don't often write recommendations so this is the real deal.