I actually found that anything over 240 vertical res was a real problem on the tablet, and 240 was completly unwatchable on my main myth. I'd suggest trying it if you are interested. Only problem I found was that it screwed my display (no scrollbars, or borders around boxes) to the point that I reflashed. I now use a combination of mediaserv to transcode on-the-fly and stream, and mythweb and/or VNC to control what myth does. What I do miss though was being able to stream TV, not that I watch much though.

I'm hoping (and wishing I had the skill to do more than hope) that we will see more progress on myth on the tablets as it is simply amazing to be able to run the fullfat client on the tablet, and a testament to the power and adaptability of the tablets and Yani's skill in porting.