A regular package of the Urnex Grindz product costs about 2/3 as much as a new set of burrs. I ran some quick rice (pre-cooked) through it without noticeable improvement. Ordered the new OEM burrs, so we'll see how that turns out.
Have a Mazzer Mini grinder from about 2008 in home use. In about the last couple of years or so, the setting for a 25 sec espresso shot has gone from ~6.5 to ~5.25. Shots are pretty consistent at a given setting, but having to dial lower to get them. In the last week of use, have 10 second shots...