I received my new Incra Miter today. My old miter had no slot adjustment and too much slop. It was also cheaply made. I decided to do the full adjustment cycle on the blade angle, blow and clean the adjustment screws, etc.

The Incra was easy to set up and I did some testing and it was very accurate with simple adjustments. The slot adjustments seem OK, but cheaply made. After ripping some angles and checking them, I do like it. 

 

 I was using  a thin kerf Frued blade. When you cut angles or you really want very good close fit, is it better to use a thicker blade? I would see a very smooth area and then an area that showed some slight roughness Probably time for a new blade

Edited December 8, 20178 yr by Ron Dudelston
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I've found that cutting angles with a thin kerf blade requires really slow passes, concentrating on keeping the work piece locked in place. Otherwise the work piece tends to move towards the blade and cause it to bend slightly throwing off the angle.

My occasional use of thin kerf blades are for ripping. Even then, I prefer full kerf. 

Stick some 80 grit paper to the metal face of the gauge or your sacrificial wood face. That'll lessen the creep.