I love the idea of MBT, been waiting for it almost a year. And it's making progress, but I'm not ready to switch to it full time. I'm not really crazy about the interface, I'd like to be able to go directly to my Collections instead of having to navigate past the Views. (Even the Roku MB3 app can do this) Once into the Movie or TV collections, scrolling to the desired title is painfully slow... things will improve when/if first-letter search (as in MBC) is implemented. The internal video player has recently become able to output acceptable video quality. But the biggest stumbling block for me is the inability to play subtitles. I have a lot of foreign movies, so subs are mandatory.
I check back every time I hear about an update, but unfortunately the functions that are important to me aren't very high on the developer's priiority list.
I keep hope alive though, that they'll get there eventually.