I've only been scanning for around 15 years or so, but my first scanner was the RadioShack PRO-164. It was a great first scanner and got me into theobsessionhobby. I sold it many years ago to upgrade to a digital scanner, but would love to still have it today for conventional analog stuff.
NOW I know the problem with the New England Patriots! You spend so much damned time fiddling with radios you forgot how to play quarterback!
Oh wait...it says Mc Jones, not Mac Jones. Uh...nevermind.
As to the question(s), I regret the four Icom IC-R8600 receivers I sold. One at a time...but, that said the score is now 5 to 4 in my favor and I think I have it figured out that I'm an absolute blubberhead if I sell #5.
The worst radio? I can't remember the exact model number but a wild guess, Regency MX-4200? That thing was so bad it suffered from severe intermod...even when turned off.