Yup, it works fine, but if you spend a lot of time in 50-50, it's going to be on the small side as AliMacs says, I think. My own use though, I don't really have complaints. In my case, I don't really do 50-50, but rather the 2/3-1/3 split. If you mostly focus on one task, but have side tasks that overlap, it seems to work fine. Think, filing tasks away into Reminders/Things/OmniFocus/etc while reading your e-mail. Having a web page, mail or whatever up for reference while working on a document or presentation. I also tend to have file managers open sometimes if I'm moving more than just a couple files into the app I have open.