I'll say they work. Last May I caught my largest surf trout ever at 29 inches on a live pinfish. I had been casting spoons, twitch baits and soft plastics to no avail, so I decided to try a different rod with live bait and a fish finder rig. I caught a 4 inch pinfish on a little spinning rig I carry for just such occasions. After fifteen minutes or so, that Abu 6500 line alarm was singing. That was the largest trout I have caught on a live pinfish, but not the first. I will not hesitate to use them if I don't have any live finger mullet or croaker.