One of the great inventions of the latter half of the 20th Century. I used to buy and sell those. However, the "upgrade," Selectric III was a bust. The funny thing is that I once bought a Selectric III fairly cheap from some dude. I mean for like less than $100. It's a long funny story how I got him to sell so low but to get back to what happened it was right at the time when people had just started to realize that Selectric III was a really lousy. Fortunately, a company a week later answered my classified ad for that Selectric III and they wrote me out a company check for $650 when I delivered it to their office on Century Blvd. near LAX. First thing I did was hoof over to their bank which was nearby and cashed their check. I didn't want them to put a stop payment on the check when they realized how disappointing Selectric III typewriters were.
I have a Selectric I that I taught my kids to type on
I also have 2 Selctric II that I use regularly
The machines are just a joy to use
I get frustrated using a laptop with the keys all flat