Not sure which comments you think rule out any specific decent breeder, or a KC Assured one in particular?
However, I know many many breeders, but not a single one that I consider 'good' who is an Assured Breeder. Not saying it's the same in all breeds, but in my breed many joined the scheme initially but left again because the health testing focus was very limiting - and NOT in a way that added value (required testing for a condition that is not a problem in the breed these days, so was very restrictive on stud dogs that could be used).
I don't honestly have a great opinion of the Assured Breeder scheme - it is touted as the panacea to cure all ills by the Kennel Club, but it's endless promotion and free advertising plays right in to the hands of many high-volume breeders in some breeds. (Thankfully, mine is not a 'commercially attractive' breed, and long may it stay that way.)
I say it every time though, buying a puppy is a minefield for those who don't actually have a fair bit of exposure to breeders to know what is good and bad - most families do it once in a blue moon, to replace a pet, and life is very different now.
I would normally say it is easier to avoid any licensed breeder like the plague if a buyer is not experienced, as although there are good ones, there are probably far more bad ones. New legislation is about to put paid to that advice and muddy the waters though, and unfortunately the people it will stop breeding are a lot of the excellent small breeders who feel scared of it and/or don't have the facilities to comply with rules that are not vital in their situation.
I haven't bred a litter in 10 years, and have no young bitches here to breed from - but if I had considered buying another decent bitch with the intention of perhaps a litter or two if they turned out well and health test results were good enough, to be honest it all seems a bit hard now.