Greg ...not to get too faroff on a tangent,I DO plan to usethe magic gizmo, and compare it side-by-side with the traditional measure / template method. I will then post a review thread on this site, probably in the general forum.
Off the cuff,the gizmo looks to be both fairly secure and you're able to make fine adjustments. You can also set it to specific amounts of slope (though that's more useful if you're a plumber).
