It's very painful to navigate the guide day to day given that all you can do is FF/REW to move the time window. Please add jump forward/back buttons to quickly move from day to day in guide. I'm guessing this has been requested before since it's a fairly obvious request (to me, a traditional grid guide user, at least).
I use day-by-day to find new shows to record on PBS, mainly. There's quite a few one-off shows and documentaries that I find this way.