Along the bottom of the interface are the five main content areas: Info, Guide, My Shows, Browse, and Manage. I'm not sure it's possible, but I'd love the option to rearrange these since I spend most of my time using the Guide and My Shows sections.
For those that like to surf using a grid view, you're out of luck: the app only has the TiVo Guide view.
If you have multiple TiVos on your network, you cannot view their recordings from here in the app. You'll have to go up to the top of the interface (where it says DVR-58EA, in this case) and switch to the other TiVo you want to view. It has to be a Premiere, too, so those with TiVo series 3 models or earlier can't be viewed. You also can't schedule a transfer of a show from one TiVo to another. And unlike the TiVo interface for My Shows, Netflix subscribers have no way to view their queue from inside the app.
Another minor nitpick: though you can expand folders to see all the recording of a particular show, there doesn't seem to be a way to collapse them again.
It's easy to overlook, but the bar that divides the top and bottom sections of the interface has two options on it: Credits and Episodes. Credits I just explained, and Episodes lets you see all the episodes for a particular series by season.