I bought several of Kenny's seats. I never had a problem with them, or with him. He ended up doing some bad business with a few people on here, and they have a negative opinion. I personally don't, but I don't discount the bad experiences my friends here have experienced.
Kenny did a custom seat for my Cat Hustler project that was a total custom job, and it was not an easy one. He also sold me a could of his el Cheapo Specials on a "Make Offer" deal on Ebay. That is probably his forte.
Manchester seats are about half the price of what I can get done locally, extremely high quality, and done with an eye towards the overall bike in a zen-stitch sort of style. Her seats come back quickly, and meet or exceed expectations.