Well,
I'm heading back to Blu-ray primarily so I figured Id give my final thoughts.
HDX - Its a great format, and would actually be fine for most. I've been a BR owner since Mar 07, and been listening to the HD audio for about 4 mo's or so. With that time in BR, HDX just doesn't cut it for me, especially with the shadow detail/black issues Ive seen.
Dont get me wrong, the blacks are good, just not great, and after spending the money I have on my tv, I'm pretty picky.
The HD and SD formats of Vudu have great PQ for what they are, and Vudu continues to add titles which is even better. I think as HSI increases, and they can bump up to a higher encode, VOD will be a player, but Im not convinced at this point.
My verdict:
If you are not spoiled by what BR offers, Vudu is great for any movie buff, and the 30 day wait on new releases is not a big deal. If you are spoiled by BR and have no problem with a $300 box sitting around for emergencies, go for it.
I have not quite made my mind up, but I think my new BD35 will be the only unit in my house and Im going back to being spoiled by Blu-ray.