Just got notice my 5500 is on the way - should be here (NJ) next week. My previous mill had a 3-axis DRO. Since the 5500 has the quill "dro" built in - I'm wondering if you are finding it t be adequate... accurate, etc. Maybe I can get away with a 2-Axis DRO and save a few bux - but would NOT want to be without one - much to handy! =A.