This is a question that begs more detail because the response to what you ask is, it depends. Can you provide a bit more background around the context of the feedback?
Feedback is definitely necessary in business be it from a customer or an employee or any other audience of the the business as necessary. If you are running a business do not hesitate to ask for one. If you are asked for one do not hesitate to give an honest opinion.
Always give constructive, helpful feedback. It helps the person receiving it by showing them how they can improve and what they're doing well. It helps the person giving the feedback by being seen as a resource, which can lead to new opportunities. Give without expectations.
Feedback.. Giving where Dimitris? If it's a testimonial one should give. It makes you a great customer and helps your provider grow with credibility.
And feedback as of a service feedback, if we want to make it construction and suggestive, it should go private so the team implements yet the new customer doesn't feel concious.
I guess the question needs clarification to get more focused answers...
It depends. If feedback is asked or at least expected, then sure. If not, why bother?
It is a Golden Rule sort of question. If you seek feedback in order to monitor and improve upon your business, you should be willing to provide the same to other businesses. Too many business owners have double standards. They want feedback, especially positive, but will only take time to respond negatively, if then.
All feedback is valuable. Positive for obvious reasons, negative for providing insight into ways to improve operations. Monitoring and responding to feedback is critical. Recognizing positive feedback shows appreciation and pride. Addressing negative shows concern and commitment. Properly addressing negative feedback can generate more goodwill and interest than some postive feedback that may appear canned or prompted.
No operation is perfect. Problems are bound to occur. Proper handling can convert problems into opportunities.
Customer service is key. Seek and provide feedback at every opportunity.
It depends on whether the feedback has been invited or imposed. If a speaker distributes feedback forms for use after a presentation, for instance, that's qualitatively different from an audience member coming up and sharing why they disliked the talk. If you ask clients/customers for input, that's preferable to receiving diagruntled reviews ~ although positive feedback is always welcome.
Make it easy for people who experience your products/services to tell you what they think, how to improve, etc., and be open to their suggestions. While I believe there's no such thing as "positive criticism," constructive input, as Bob Turel notes, can make a huge difference for your business going forward.
Give feedback when you have something worthwhile to say. Positive or negative, but especially when negative. But couch the negative with a positive statement first, the suggestion or criticism, and then follow with a final positive statement. That way you provide useful information that advances things without alienating or hurting feelings.
Give feedback. Always ask for feedback/testimonials. 92% of buyers trust reviews over websites. Good reviews land you pre-qualified and pre-sold customers. If you don't have at least 10 positive reviews, Google will not post the views. A company with 10 great reviews will be called over the competitor who has three reviews. Also, having a solid 5 star reputation will always trump the top listing in Google. When giving feedback to another company or individual, make the review genuine. Definitely ask if the customers' expectations were met and results were delivered.