At my first programming job I was at an ISP and was making the bandwidth provisioning and enforcement system. I was trying to tell the networking operations guys that it was pretty good these days and they said "Oh - OK we are putting the dev team behind it moving forward". Apparently my face was priceless. I know that sinking feeling in my gut changed my mind about a lot of things that day.

Dogfooding is good - it certainly changes how you think about things anyway.

It isn't sufficient for good software, but may be necessary -or at least when possible (sometimes you make software that has no direct application to your life...).