Ahh, see, that's the rub. I can't give that kind of "that's not working" feedback to someone else very effectively unless they:
a) have actively asked me for it
or
b) we have a long relationship of trust built up between us, and I ask permission.
(or c- they are already enlightened spiritually, and can take everything in the right spirit. ;-))
For instance, I'd love it if someone from Qwest, for instance, were to honestly ask me to give feedback to them about what doesn't work, or what hasn't felt good about their service- if they were inquiring in a spirit of truly wanting to hear me, and to know what's wrong so they can improve their business and their service.
My suggestion is, as business owners, that we give that gift to our clients- of truly asking for what's broken, what doesn't work, what they didn't like- and make it as safe and possible for them to speak up past the normal reticence people have to give honest feedback.
If you do that, your customers will, literally, give you huge pointers on how to run a successful business.
I can, however, share feedback we've gotten from our clients- in a general sense- without breaking confidentiality if that's interesting to you.