We've not used any that look like the one's pictured in Valley vets online catalog, but we have used some similar. If they stay in, they work, but usually 1/2 of them fall out in a few days, and then over a period of a couple years you'll find one layin in the pasture here and there.
We tried it on a few heifers we'd kept away from the cows for about 6 mo, cuz they went right back to suckin. Aggrivatin to say the least...the one's that did that, had a short ride in a long trailer after the "no suck" thing fell out.
