A very simple guideline I use is what type of customer service would I like to receive myself? So, I * try to respond to email quickly. * don't write email l

A very simple guideline I use is what type of customer service would I like to receive myself? So, I * try to respond to email quickly. * don't write email like it's a press release. * don't write too formally. * issue "refunds" (for iPhone apps, I have to pay for Apple's cut). It's troublesome. I have to pay instead of refund. Some people have PayPal, some don't, Some have Amazon accounts, some don't. * treat the party at the other side as a human, like I want to be treated. * build a good product, and keep it good it's surprisingly easy. So next time you are at the receiving end of good or bad customer service, note it down. PS: We really need Markdown or something similar.