I recently came across "bugs in Intel Processors". see here. What Intel calls "Specification Update" is in fact a paper that lists known bugs in the Intel Core M Processor family (Broadwell ?). A quick search at the competitor revealed that also AMD admits bugs.

@Michael: The "processor war" was recently dominated by GHz and Benchmarks. I think it could be an idea to shed some light towards the "quality". Seeing that Intel plans to fix only one of the 57 bugs is a bit disappointing.