iBox jig users

A good quality dado works fine for me. I made 20 backers before I ever used the jig. The lack of a sacrificial "shelf" is a disappointment and can still give a bit of fuzz even with a backer but, overall a good backer will cure your ills.
 
A dado would work fine Rob.

Some dado blades don't make a perfectly flat cut, and may have slight little 'points' ground on the outside edges of the outside blades. Not really a big deal though.

These box cutter blades though also make it very easy to dial in the 2 widths without having to adjust with shims. Put them together one way and you get 3/8", the other way, 1/4".
 
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