Frank Erskine :
The problem with pop-up (when it works!) is that the toast gets cold a
lot quicker out of the machine. It's much better to leave it in there
until _you_ want to take it out to butter it...

That's if you like your butter melted. I prefer it not melted, so
cooling quickly is a Good Thing. Having said that, our Tefal toaster
pops it up only a little and you need to press a lever to raise it more.
That's better than popping it right out onto the floor, though.

--
Mike Barnes