As I mentioned in this post, proof is very important if prospects are going to believe what you have to say. You may have this great product that makes the user look like a Hollywood star overnight (without plastic surgery) yet how many prospects are likely to believe it works?
Even if your product isn't quite as unbelievable as above... it still needs to be backed up with proof. After all, how many companies harp on about having amazing customer service that turns out to be horrible? I'm sure you've experienced a few...
So how do you prove what you're saying?
The quick and easy answer is testimonials. You should simply ask every client for feedback (and permission) so you can display the results on your website and marketing materials. Most clients will be more than happy to do this for you if you've done a good job... and they'll be even more eager if you haven't.
So you win either way... you identify problems in your business or get powerful marketing aids. All from one little question.
You can start by emailing all your current clients and asking for feedback and a testimonial if they think you deserve it. You'll be pleasantly surprised with the results.

