I haven't used #83 in...forever, probably since 105/205 came out. I just have had 80/82/83 sitting on my shelf unused for 15+ years and decided I was never going to use them for anything...but I'm a packrat (hoarder?) so I was only able to get myself to throw out the one, so far. I only detail my own cars and sometimes a friend or family, so I hardly do any polishing anymore, although most of my cars need it. I've been using the Optimum polishes for a while, but I haven't bought any polishes for a long time, so I missed all the Sonax/Boss/etc. fun. I am eyeing up the Dr. Beasley's NSP's, and they have a Black Friday thing going on...so we'll see.