I haven't really gone back to the stock burrs. I had some experience with them in a Dose Pro and a different machine. Last I checked, the OE burr set was no longer in stock on the website so I am not sure if they are still an easy upgrade option. Breville does not offer the conical burr as a replacement part, although I have seen them starting to pop up on 3rd party parts websites.

The Breville website lists the Etzinger upper burr only, but the company has both the upper and lower burrs available. If you call them they can fulfill your order. Mine arrive tomorrow. Looking forward to trying the new burrs!

I am not a professional barista, and not even an experienced home-barista, but in my little experience they are pretty amazing. My Breville Smart Grinder Pro has had a few pounds of coffee run through it, probably 10 pounds or less. I got a Breville Dual Boiler to start playing with home espresso drinks and found that I had to adjust the "internal" burr setting (the upper burr carrier adjustment) from the factory setting of 6 to 3 to get a grind fine enough to pull shots that were developing normal pressures and normal brew times. With the Etzinger burrs in place it is almost the opposite. After first running about 3 pounds of old coffee through the grinder with the new burrs, leaving the internal burr setting of 6, my 18 gram shots are running 30 seconds for 36 grams out with the "external" grind setting around 16 to 18 and the espresso tastes great.

The burr set that is available on the Breville web site ($26.95 upper burr and $21.95 lower burr) is listed on Amazon at $79 each or $158 per set instead of $48.90 from Breville. I did ask Etzinger if that was actually their burrs on Amazon or a knock-off. They researched it for me and said that they did not know, but that it could be, as they sell their burrs in bulk to a Chinese firm that manufactures the machines for Breville. The Etzinger rep said that if they have the Etzinger name on them they are likely the real thing (albeit for a whole lot more money than from Breville). I sent a message to the company that lists the product on Amazon and they said that the product is indeed Etzinger despite listing the country of origin as China not Lichtenstein.