Have you taugth Brian or John recently???
Did they have the smart stick with them?
Talked to John on the phone last night (before your post came in). He mentioned in passing that he likes the product and uses it "every now and then" to verify his alignments.
Brian learned of it through John, and we talked about it over the phone one evening last month (before he had the product). While on the phone, at my suggestion, he rigged up a makeshift version using a club and coathanger. I have talked with him a couple of times since then, but the SmartStick was never mentioned.