They are nice. I had an Intellitouch when they came out in the 90's. Piece of crap it was and it was like 70 bucks. Was handy though when I was at Bluegrass jams. They are much better and much cheaper now
Is the fiber from eating the worn out sandals?"Why did I wait so long to buy a headstock clip on tuner?"
For the same reason I waited so long to start wearing socks with sandals and eating more fiber.
I always used my harmonica for tuning instruments until the night I tried tuning a mandolin in a noisy club. I bought an Intelitouch clip-on the next day.