They are a good bait, however relating them to being as effective as peeler is perhaps the reason for there dip in popularity. Good yes, but in my opinion certainly nowhere near a fresh peeler, or even a frozen one. I think what is very attractive about them though is that they are cheap and readily available from tackle shops and supermarkets, unlike the peeler crab (unless you collect your own). I have taken small codling, coalfish, pollack, whiting, dab, flounder, wrasse and dogfish all on just a plain tiger prawn so a variety of species do take the bait. I would also say it is a good 'standby' bait in the Northeast for whiting when they are in if you get let down on your worm (although so is squid and mackerel). I have had success with it over the Southwest coat of Scotland on it aswell for coalie and dogfish too. On other venues i have not caught on it, and a switch to black lug or peeler has sometimes bought a response. Occasions when it has just not worked, are when i have used it fishing for bass, when i have tried it after being unable to find them. Also on a few occasions when fishing into the Northumbrian kelp for red codling aswell it has failed to produce a response. Noticably when others around me using peeler caught a few fish. It is worth carrying as it makes a decent bait or a good tipping off bait, however i just think that rating it the same as peeler is very misleading. try it and if it doesn't work so be it, if it does then keep using it. i have found that it can be regional, and sometimes it has worked on some marks then not on other marks near to the venue.