Yeah, my own printer was only a month old from its first print when the 3S stuff started cropping up.
I mean, I get products improve... it's not a major change but I'd definitely have waited a month if I knew a "larger" part revision and design was on the way.
Guess I can't complain as I'd always planned to do the bearing mod if the existing sensor gave me any issues. So I'm mostly just interested in the revised extruder design for easier servicing. But annoyed because it can't be done without also changing the sensor - so I'd have to either buy the upgrade or wait until someone remixes the parts. $20's not a big deal, it's the fact that shipping is gonna cost more than the upgrade