I recently got a bag of sticky tongue farms vit all to try an my crickets seem to like it. I usually use bug burger dry with a mixture of fresh fruit and veg to add moisture. Not seen many others use vit all though.
I use it. It doesnt powder very well on its own, i mix it with calcium to get it to stick. Stickytongue made it for gut loading, not powdering. It disappears in the bug tanks so i assume they like it.
Mental note, unlike most reptile vitamins, it does not have D3 or any calcium.
I am only using it as a gut load and haven't tried putting it on feeders. The cricketseem to like it. Not been using it long enough to see any great effects on the chams.
I use it as a (dry)gut load as well, have had success with it too(the crickets eat it up). Put two trays of it in my cricket bin and then add some chopped/diced fruits/veggies in two other separate containers for variety.