I fly with a 19mm lens and yes it is really hard at first, but you get used to it after a while. Landings are a bear and you have to line up from a long way out.
I'm using the Tau 320. The quark is a little smaller, and supposedly their autogain software has gotten better.
I have a handful of videos of it in use if you want to see what its like.
This one contains hunting footage but nothing can be seen getting killed in the following vids so I can stop earning points.