I've never used one before and I just bought the Rockler tenoning jig. I'm measuring it at about .017" out of alignment with the TS blade and there is no adjustment on the jig to get it more accurate. My measurement for out of alignment is just on the fence of the jig so across the 4" or so it is out by 0.17".
So first question, is that too far out? Do the "nicer" jigs have adjustment screws to align the jig properly?
Second question, maybe I'm expecting too much? I'm trying to put very accurate tenons on an 11" wide board. Is a tenoning jig ever going to be accurate enough for that or should I use another method to make the 2 tenons on that board?