I've had the "standard" Vudu for a while, and it is an excellent product. My one complaint is that I've "bought" enough movies that the smaller hard drive in that unit sometimes gets over-run. If I didn't have the older model, I'd definately get the XL.
Audio/video quality is quite good, download speed usually decent, and program selection quite good. Having the ability with the new "Vudu Labs" stuff to watch YouTube on my main system when there is nothing on and I'm not in the mood for a movie is also cool.
Very Much worth it.