I've always loved the Vinty 2-1B in my collection. I don't know why, but it was maybe the deco and the clear belly... Kenner seemed ahead of their time with that one. I actually STILL include Vintage 2-1B figuers into my modern collection and customize them some. They seem, to me, like a basic tool all hospitals would utilize, ya know? And that there's be many models but they'd be slightly different, like cars, or astromechs.
It's rare a vintage figure still can find a home on a modern shelf I think.
The POTF2 2-1B was equally well liked by me, but I wouldn't mind a more poseable set of legs and arms of course. ROTS looks too different for me to accept they're the same beast, so I've kept my POTF2's in circulation. I loved his diagnostic accessory too. Very cool.
Like very few other POTF2 figures, I still buy 2-1B's if I see them for cheap. I nab them for $1 or $2 or so... Paint them up in various decoes, and fill up scenes with them. There was a sort of "receptionist" droid based on the 2-1B look in a video game too, and that always was a custom I wanted to do (and didn't). Maybe time to bust out the paints.