I do. I was accused, in my days at Yahoo, of "single-handedly keeping e-commerce alive". I was the king of next-day-air packages, and the receiving department would ask me if everything was ok if they were doing their rounds of delivery and didn't have anything for me. Suffice it to say that I have experienced the gamut of customer-service.
During the dotcom boom, by and large, customer service was awesome. Companies seemed to actually care about their customer, were polite, delivered on the goods or services they claimed to offer, and life was all-in-all good.
Contrast that with today. My posting of a couple days ago about DVD.com seems to be the tip of the iceburg. I just went round and round with the halfwitted customer service rep at Barnes&Noble.com, wherein he tried to explain to me (falsely) that "FedEx Overnight delivery is 1 to 2 business day committment". I explained to him that, NO, FedEx Overnight Delivery, as a product, is an overnight committment, or your money back, or the shipping fee is completely refunded, per standard FedEx policy. So when my package is late, YOU can get your shipping funds refunded, thus I want my shipping funds refunded.
I've been studiously avoiding Amazon for years (they lost me at the One-Click fiasco), but I've yet to really hear complaints about Amazon, although I have been hearing more and more rumblings about bad customer service from the folks at B&N.
Pretty soon I'll actually have to visit retailers, pay for parking, etc., and that'd really annoy me. :(