That's really relevant, actually, because I've been struggling with that question. I realize a stoptail might be more reasonable for a beginner. And my interests don't include the sorts of rock that include aggressive whammy effects. Among a few different styles, I enjoy blues-tinged rock. And while, as far as I can tell, a lot of tremolo work in that style is simply done with the fret hand, there's a particular piece of music that finally motivated me to take up guitar in the first place: the opening theme to Better Call Saul by Little Barrie. Sort of blues; sort of surf. Really cool. I just really want to learn that opening riff, which includes a downward tremolo (correct?). Here's a brief video, showing the lead guitarist on what I assume is a Gretsch Streamliner with a Bigsby. So if I ever want to perfect that riff, I'm gonna need a trem, but I'm trying to look beyond a single song.