Ouch! Ah well, I've never used those on either my kids or my dogs. I have tethered the dogs, BAAAD dog (didn't have a crate) but I've yet to tether the kids even though I did have one teen who probably would have benefitted. I guess grounding them is similar to tethering a dog.
My mom used to tie me a highline when we were camping, but that was more of a portable fence than a punishment :~D