With a Retina Macbook and am very impressed. It drives two 30 inch displays - a HDMI 1080p HD monitor -and doesn't seem to mis a heartbeat. My 2008 Mac Pro certainly didn't feel as snappy. Will it last five years for professional work? I Doubt it - but who knows - I expect it will do very well for the next two or so before we upgrade to the New Mac Pro. But until then, certainly very impressed.