It works very well. We also have a basically-no-questions-asked early voting for a couple of weeks. Nominally it's intended for if you're preoccupied (overseas, working, etc.) on voting day but in practice people use it to dodge the lines.

That said, we also have so many voting booths (I have never not been able to walk to my closest - usually only about 1km away) that the worst line I've ever waited in was probably 10 minutes.