When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
You're certainly going to get every answer in the book here since you're asking about 'quality of service' that so greatly varies even within a given company based on the individual you're dealing with. That said, no answer is really worth betting on, unfortunately.