As a product guy for many years I have used multiple methods / tools to collect user feedback. Some analytic tools that are under the hood like Google Analytics, Omniture, Kissmetrics, etc and others that are on the face of user like WebEngage, UserVoice, etc. If you love your product, any amount of feedback that you receive will be less.
For Wishberg, we wanted to hear more and so we introduced a feedback screen on the logout page. When any user logs out of his Wishberg account, its right there for users to share how their product experience was. Try out how this works on Wishberg, alternatively below is the screenshot of same.
The rational behind doing this is simple. If you have noticed, few years back when you logged out of web email services like Yahoo or others, they placed a huge banner advertisement on the subsequent page. Many of these advt banners had a CTR of 3% to 6% making it the most prime properties for advertisers. We replaced that advt spot with feedback.
Users have been very vocal in telling us what the love/hate about Wishberg and also pointing out what they want in the product. For a product owner it is probably the best way to collect feedback, equivalent to talking to your users. I hope to see many more product owners doing something similar to this.