Dayum. Sounds very good but after talking it over with my wife, can't do it. But I didn't want to leave the impression that your answers didn't make for a very attractive sounding grinder.
For anyone else who's interested: 100 pounds of coffee a year is not a lot of coffee. After 750 pounds, the machine undoubtedly needs to be completely disassembled, cleaned and the old burrs removed and replaced with new. If that sounds frightening, it shouldn't. Those things are very easy to do for anyone who's figured out which end of a screwdriver to hold. We're talking about 45 minutes max. I did a bit of research before talking with Linda and found that new burrs are still readily available and reasonably priced.
If there was any way I could justify another grinder I'd buy it. The best price/quality alternative for a used, commercial espresso grinder would be a used Super Jolly; and (a) those aren't nearly as easy to find in good condition as they were; and (b) the Mr. Espresso/Obel is probably a better grinder anyway.
There is absolutely no comparison between Chef Layne's lightly used commercial grinder and a new "burr" grinder with a small diameter burr set, and low-powered, high-rpm motor. This is the real thing; a Kitchen Aid Proline, isn't.