I bought mine well over a year ago and the first pouch tore out the stitching after 2 months. I stitched it back together using Spiderwire fishing line and it lasted almost a year until the rubber tore. I had nicked it with my handsaw and it tore the next time I used it.
My bigshot head now stays stored in a 5 gallon bucket (which also holds my throwline) so it is protected from sharp edges, oil and sunlight. I would guess that most damage to the bigshots are caused by improper storage.