Do you have a long letter to write? OverType's simulated ribbon will run out of ink halfway through.
Are you interested in simulating the experience of typing on an older typewriter? Keys will completely break at random.
Forget line-wrapping: on a typewriter, the only way to get to the next line was a hard carriage return, meaning that in OverType, you're constantly on edge that your words will run off the page.
And don't expect clean typesetting: even the best typewriter is going to make your lines jagged.
I have all of these memories. This is amazing.