Yes I have used it in my larger survival kit. It is made of pine wood, waterprooft with resin I've found a few disadvantages:
- You have to use a lot of dust if you want to start a fire. A bit won't work.
-If it's windy it's all over the place.
It does make sence to put it in a kit as addition, but it shouldn't be your only form of tinder.
'Prepare for the worst-case-scenario, because the worst-case-scenario is: not being prepared.'
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''It's time for Plan B...'' ''We have a Plan B?'' ''No, but it's time for one.'' -Stargate SG-1