Yes I do, and I love them. I try to use them on any blind hole smaller than 1/4-20.
The worst ones I did were 6-32 in 316SS. I had to use moly-D, and you could hear the tap click when the spindle reversed.

Those 303SS parts that I posted in my Rev B thread were all roll tapped with an M2.

Use the proper tap drill. What size tap you running?

1/8" drill

400 rpm on tap. Try it with good flood first. moly-D will wreck your coolant. If you have to run your coolant 1 or 2% richer.
The only roll tap parts I used moly-D on were the 316SS parts.

Sorry I forgot,

Yes use the moly-D.

Watch your thread form and don't go to high on your tap drill size or you're not really getting "threads".

The rolled threads will not have a full peak on them since the material is extruding around the tap under pressure. They will have what almost looks like a little v-notch instead of a peak.

This is normal but too much notch and you only have basically a thread form and not a real thread, but a thread gage will still do go-nogo on them so it might fool you. Use pin gages to ensure you're inside the thread minor limits and you should be good to go.

I just thought of something else. In any blind hole tapping it's pretty important to make sure the holes don't have any chips or other debris in them prior to running the tap.

When you're form tapping it's absolutely crucial. A small chip that a plug tap might have just ground up or pushed out of the way will snap a roll tap in no time flat.