Even if there are still some issues, the current version is actually quite stable.
They are really close to release an RC version, and Angular 2 final will arrive very soon as well.
There will not be breaking changes between the current version and the upcoming one for V2, and a very good "how to upgrade"guide will be given by the ionic team at each new milestone they reach.
I believe Ionic2 is completely revolutionary compared to Ionic1, you have no idea how pleasant it is to work with it. So just go for it !