It seems rather strange to me that this topic keeps popping its head over the wall.
Out of thousands of satisfied customers a company enjoys, some will have problems for one reason or another - it's the law of averages as a result of assembling a range of components from many different supplies in many cases.
So you only hear from the unhappy customers and very rarely from the satisfied ones if, by any chance, after sales service and support is not what may be expected.
That, in turn, completely distorts the true state of the quality and service provided by the majority of companies.
If they were all so bad as claimed then they would eventually go out of business.