If you want a really fine grind in a hurry you can use one and get ok results. You have to let it rest every 30s or so to cool down or it heats the grounds too much. I liked to shake it while grinding too. It isn't quite Turkish grind and there are a few large pieces that won't get full extraction, but if you want really fast extraction (or fast intentional over extraction) it works.

Yeah, a blade coffee grinder. For sure don't run salt through your expensive burr grinder!