I used the app last season on a premier and it worked just fine. Well as fine as MLB can work, I'm not a big fan of the program, it needs a lot of work but its my only option to watch the Red Sox win another world series.
The app works at least as well on the Tivo as it does on my computer which is, of course, much more powerful.
I've been a subscriber for 4 years now so if I can be of any help let me know.
"Luck is the residue of design"
1 S2 Tivo w/lifetime retired
1 HD Tivo Lifetime
1 Roamio OTA only
60" LG Plasma
60" Vizio 1080P
36" LG HD