While I've had to have my Xbox 360 repaired multiple times, Microsoft has done so in a timely manner and for free. Even when it was out of warranty.
Overall my customer service/support experience with them has been very good. I won't say excellent because it took almost two years to identify the source of the problem. The order of patch installation (not something I can control) would eventually kill the DVD drive.
It sucks when you have to get a product repaired under warranty, but it's awesome when a manufacturer sticks behind the product and sticks with you with it. The fact that to Microsoft my continued use and happiness with their product, so much so that they were willing to foot the bill to make me happy, shows their customers are important to them despite being a major corporation.







