Tried them a few years back when I was in Bristol and they were a cut above the usual high street brands. Oddly, I order them via Amazon (as they're not available where I live) and give away several packs to a friend who lives in Gloucester ... where they ought to be readily available, but aren't.
One of the problems we have when buying crisps in normal shops is they only seem to sell rubbish / cheap stuff. It's only when you open a packet of Burts Potato Chips when you can fully understand the crunch of the crisp, it takes me right back to when I was a child when my parents used to get "posh" crisps.
This is a box of 20 normal size Chips / Crisps, but the packets are in-fact full. We have all seen Walkers on BBC Watchdog saying how they only fill there crisps half way as they want extra room so the crisps don't get broken. You get none of that rubbish with Burts Potato Chips, they really are FULL packets!