I cant give help from experience as im not a great lover of puppy pads and never used them .. Simply because i dont like praising the pup for going on the pad in the house.. I believe they should only have the praise when going outside in the correct place. I feel its sort of training them twice teaching them first to go to toilet on a pad in the house then afterwards teaching them not to go on a pad and outside is where they need to toilet.. I think its confusing. (im the same with skin children and pottys! Straight onto the toilet is my way of life.. Miss out the middle step!
Anyway.. Im babblin on lol thats just my personal opinion. Perhaps the puppy pads have a scent to them that Buster just cant get enough of. My sisters husky used to rip to shreds a certain make of puppy pad but if she had another she wouldnt touch them. They had a different scent and feel of material.