I think it looks quite nice in it's current leggy growth.
Before you start trimming, I would ask yourself what your goals are. Perhaps your goals are to give it a certain shape or set up a certain future piece of growth, but it also might be to make as beautiful today as you can.
I happen to think all of the above would lead you to trimming, as would the plans of most people with this true, but it's important to have a goal in mind before you start working.