My phone was past warranty by five months and the local Apple store manager clearly had been directed to not accept any responsibility for its early demise. Hopefully my case is a relatively isolated instance, but needless to say we are NOT going to do the same upgrade for the other iPhone in our household.
Dependability has been a key reason over the years as to why Apple has been able to charge a premium for its products. Already under pressure from cheaper Android devices, Apple had better hope that this ends up being a small scale problem. (P.S. Typed on a five year old MacBook Pro.)