Great precision and variable control of grind size.
Positive Product Points
Precise, great control of grind size, heavy, easy to use, no static, much quieter than expected (based on descriptions of other grinders). My espresso is good.
Negative Product Points
Plastic hopper and lid are light and breakable relative to the otherwise very sturdy materials. The Portafilter Holder Adapter is also a bit flimsy and does not hold my portafilter well (Gaggia Classic).
Caveat: this is my first espresso grinder. I previously used a very cheap Delonghi burr (excellent waste of 40$) and then a Hario Slim (good value for coffee).
I use a bottomless portafilter with a Gaggia Classic and have spent the last 3 months working on my technique, initially with a Hario Slim. I finally gave up on the Hario. This grinder has allowed me to enjoy making espresso. It is very precise and sturdy, except as noted above. The fine, continuous settings are great. I can adjust to create a pull of any length. I was surprised (based on reviews of other grinders) how little coffee was lost inside the machine (almost none). It appears to be well designed to avoid waste. The chute is vertical and immediately beneath the burrs, so there appears to be little opportunity for the grounds to adhere. I spent hours pouring over reviews of grinders under 500$. I could find nothing that received better professional reviews (the review from Coffee Geek claimed it was the best machine under 1K$). My only concern was that it is a new product. I pulled the trigger and do not regret it. My wife's only concern was that I not clutter her kitchen with "ugly coffee crap" (not a fan). She was very impressed by this machine's aesthetic contribution.
No problems. Email receipt, routing information link to Fed Ex, quick arrival.
Three Month Followup
Everything I said earlier remains true. It has been easy to maintain. It takes about 5 minutes to remove the burrs and clean them and other accessible parts. The lack of wasted grounds is very impressive.