I came into this forum to ask just this question, or one pretty close. I use a Zona saw all the time but getting the perfect angle and holding the saw perfectly square makes for imperfect cuts. I was looking of something to true up my cuts. The link to Micromark and the mention of the Tru-sander was exactly what I was after. I thought about making a copy of it but ordering it was so much easier.
Thanks,,,Matt