Hi there was a guy using this the other day on my local lake. There are that many carp in there you could walk on them and they will take any thing you can put on a hook that floats. He didn't get one take with the magic bread soon as he put some thing different on take with in minutes.when we surface fish there we do put the bait straight on the hook there that keen to take and they go to 20+ he was using plain magic bread personal i don't raitt it but that's just my opinion from what iv seen of it.
i saw a video for this stuff on the net somewhere and it did look amazing.
They were using normal mono to cut it, when added to water it would expand in seconds and looked like a normal piece of bread from the centre of an uncut loaf but it was rubbery and stretchy.
They were also rolling into tiny balls suitable for say a size 16 hook again as soon as it hit the water it fluffed up.
They also used a piece of the crust as a pop again it looked as tough as old boots and all this was shown in a tank test.