This is a fantastic app! The authentic dalek vision effects are amazing. Before DoctorWho, I used to think to myself if I had the time, I was going to write a photoshop filter to do this. Now, thanks to the amazing talent of Paul Gee, I don't have to.
Besides adding effects on still photos, DoctorWho can process videos (even high def quality). Video takes some time to process, but it should be expected, due to number of frames to be processed, and CPU power of iDevice.
Do yourself a favor and buy DoctorWho. It is a must for any Whovian or member of the cult of Skaro