Just for the record, my Incra V27, the least expensive miter gauge that Incra makes, works as well as their best one I suspect, in regard to accuracy. It is limited to increments of five degrees which for me so far anyway has been all that I have ever needed. However, mine did need to be calibrated when I first got it. The amount of movement that is available for calibration is very small, but the calibration did need to be tweaked. Mark Muelller of Incra showed me hot to do the calibration, and in my attempt to do the calibration I learned that a cheap ten dollar square that I had bought from the local hardware store was not square. I had to buy a good square that cost about what the miter guage had cost. $70 each as I recall now.
I'm going to repeat what I wrote about on the forum sometime back as this seems like a good place and the time to do so again.
My brother was just beginning to turn some bowls on his new little Delta lathe and wanted to do a project with me. He asked me if I'd glue up some rings for him to use.
At one point he wanted some six sided rings made of contrasting wood. This required that the miter gauge be set at 30 degrees and that six parts be made, requiring 12 cuts. I started making the cuts with a thin kerf blade in the TS and no matter what I did there would be a very slight gap in one of the joints. After I put a full kerf blade on with one stabilizer I cut several rings with absolutely no gaps, each of the six joints were tight, no gaps what so ever. This attests to the accuracy of the miter gauge. It also pointed out that the thin kerf blade has a bit of flutter in it compared to the stiffer and more stable full kerf blade.
Now, I suspect that most any miter gauge can probably be set at the correct angle with somd puttering around but if the part that fits in the miter slot on the TS is not tight, should say fits properly, the accuracy that one expects from the gauge will be diminished, and the way that Incra deals with this is part of what makes their product work as well as it does, very important.
Bottom line, what has been said so far on this thread about the Incra, as well as the Osborne miter gauge is reliable and you won't go wrong with either one of them.
I do hope that you will let us know which way you finally go.
Jerry B.