Buzz,
I agree totally, I am glad you posted as I had some of these blades in U Shank, but I recently picked up a really nice Bosch 5.5 AMP heavy duty jig saw.
I have used the "knife edge blades" to cut rigid foam, homasote, and most recently some 3/8 inch thick commercial carpet tiles I installed in my train room.... It's great to have a part # for a Bosch T shank knife edge blade, these things are great.