I love the Tempe Orbit. The best part is that it is free! Since moving here six months ago, we have taken the Orbit numerous times as it runs right past our condo complex to Mill Avenue. It runs about every 15 minutes, give or take a few minutes...I think we waited once for 20 minutes but it wasn't a big deal. Even if you aren't standing at one of the bus stops, you can flag the bus down if you are walking and it will pick you up. Of course since it is public transportation, it offers awesome (and I do mean awesome) opportunities for people watching. In fact, we have even started to notice some "regulars" who are quite the characters.
Minus one star for not running past 10 pm.