Lately I've been using MF on the 7D and I have to say, it's easier to MF on the 7D with the stock screen than it is with the T1i with the Katzeye. If I knew then what I know now, I would not have bought the Katzeye. It works ok and if your only body is a Rebel model then it's worth it. But I can't say the T1i with the Katzeye is better than the 7D with the stock screen.