I always want to hear from people, regardless of whether you have a complaint, a suggestion for improvement, or just want to say thanks.
I get a lot of email and simply can't respond to all of it. But I do read it all, and try to respond to as much of it as I can. Don't hesitate to let me know what you're thinking, but if you don't hear back from me within a couple of days, don't be too disappointed. Alternatively, if you really want an answer and don't get something the first time, you can always try again later. Sometimes, the reason I don't respond is simply because I'm too busy. Trying again later might result in a different outcome.