Customer Rating: 
Summary: Excellent tool!
Comment: I build dollhouse miniatures, and this ruler is indispensable. I bought it after trying repeatedly to cut four cabinet drawer fronts all the same size. Now I not only have matching drawers, the drawer pulls are all in line, too. The T-rule insures that all the measurements start at the same place, and the slots in the ruler insure they end in exactly the right place. No more time wasted lining up the end of the ruler exactly with the end of the wood, and no more time wasted trying to be sure to mark in the exact same space in relation to the line on a "regular" ruler. Worth every penny!
Customer Rating: 
Summary: can be useful
Comment: I can see where this instrument would be useful in many professions. You can even use it as a regular ruler without the guide. Just hope it holds up and I don't accidentally make it unusable. It is flexible like a sheet of paper. I wish they made a metric version because I want to convert to metric. SAE is just a waste of my brain space. Actually a lot of society is a waste of time.
Customer Rating:
Summary: Surprised how thin this is
Comment: I was surprised to see how thin this is! You can hold one end and the other one will bend like a pizza slice. For the price I was expecting something more solid. It is nice to have all the markers for repeatability and such but I'm afraid to break this one!
Customer Rating:
Summary: Excellent marking machine
Comment: Just like the other folks say, this is a great addition to any shop. I find myself reaching for my T-Rule more often than most of my other measuring tools. I use a standard marking gauge to mark mortises but I use this tool to set up the gauge. The little holes are perfect for this job because the pins sit nicely in them and make repeat setups a breeze.
Customer Rating:
Summary: Accurate, Easy-to-Use Measuring
Comment: I bought this T-Rule along with Incra's marking rule and their "bend rule." All are terrific and useful measuring devices, and I use them on practically every woodworking project I do. They are accurate down to 1/64", and there are convenient marking holes at each spot. You can use these holes to make a perfect mark at the right measurement. Of course, it's up to you to draw a perfect line across that mark and cut it on your saw, but the Incra rule helps you put down a perfect mark to work from.In some of Incra's brochures, they show a way to use the T-rule to mark your lines. You put the pencil into one of the marking holes, and then you slide the rule along the wood's edge. As the rule slides, a perfect line is drawn. I don't do this myself, but I see that it's possible.
The T-rule is made of sturdy material, and it is dead-on accurate. The rule portion is flexible but strong. It can slide along the "T" section, depending on how you need to do your measurement. There are two adjustment knobs, which you loosen, then move the rule, and then re-tighten the knobs. When locked, the rule is held down securely and accurately. (As an aside, the "T" also has that trademark red color I associate with Incra products -- it has a soothing quality for me.)
Although the rules are made of thin metal, they are very strong. I've dropped my rules a few times, even stepped on the T-rule once, and it didn't seem bothered by it at all.
One thing to be aware of is that the measurements on this rule are in 1/32" and 1/64" increments. This means you have to convert into 1/4" or 1/8", which isn't too much of a problem, but it is something to be aware of. It's a fine trade-off for such accuracy.
Over all, this is a great product that can be used in every furniture-making project for accurate markings.
