I bought a Ts-Aligner Jr. about a year ago and now I couldn't
imagine not having one!  Simple and very accurate are the words that
come to mind.  Being that the unit has 3 bearings on the base that
allow for travel within the miter slot was what first caught my eye.
Anything that doesn't provide for this type of movement is of little
use to me especially on a table saw.  It is very easy to use once you
learn to relax and pay attention to what is going on with the
indicator.  

  Being  that it measures in increments of .001 of an inch it is
actually more accurate than what the average woodworking job
requires, let face it, humidity can change things more than that much.
However this degree of accuracy is exactly what I require just to keep
my mind at ease about things like kickback,  material finish and blade
wear.  I mostly use it for setup before rough sawing aluminum, I use
that term VERY lightly being that there isn't anything rough about a
cut made after such accurate setup.

  I also feel it important to mention that the tool is only as good as
the machine it is used on.  There are a great many machines out there
that are, for lack of a better term, "junk" and those simply cannot
adjust enough to take advantage of the accuracy of a dial indicator.

  The Ts-Aligner is nothing more than a well designed base that an
indicator mounts on.  Do keep in mind that the bearings I mentioned
above can be removed so that the base can be clamped just about
anywhere your imagination feels the need to put it.

  All in all my impression is that the tool is very stable, accurate
and above all, quick and easy.  Well worth its modest price!

                                                   Happy Woodworking!

Chris