I notice that BBC (and maybe some other channels) tend to film most of their content at 25fps. This looks okay with slow moving cinematic content, but with any fast camera movement 25fps gives me a headache. I feel like I need to switch on motion interpolation. 50i is a lot more comfortable and easier to track motion. Thankfully most sport is still 50i. When we moved to HD, surely we should have moved from 50i to 50p. 25p just seems like a step backwards to me.