I’ve recently bought a Wacom Intuos graphics tablet and wanted to use it with Balsamiq. Everything works quite fine, apart from scrolling. When scrolling vertically it jumps a lot and also moves much faster than I move the pen. Scrolling horizontally is almost impossible, as it scrolls vertically at the same time for some reason.
I have a MacBook 13" (late 2014) with most recent updates to the OS X and tablet drivers too.
Even on the Mac’s touchpad the scrolling experience is far from ideal, it’s laggy and does not really reflect the real movement of the finger. I am using Sketch 3 too and the scrolling there is spot on, very natural and fluid.
I love Balsamiq and use it every day, I was hoping that after migrating from Air the scrolling would be better but unfortunately it’s still far from what it could be.