Started using them late last year. Now, bear in mind I’m fishing warmwater and stillwater, with my smallest tippet size being 4x. I do, however, like the way they roll over very much. I use 5 1/2 foot ones which I add 3-4′ of tippet to, up to 0x if I’m bass fishing in cover. They do require a floatant if you want to fish dries, but a treatment of Mucilin works half a day in our sub-tropic climate…folks in trout water say it’ll last all day. They have zero memory.
If you happen to get a windknot, get it out quick, a downside