One of the hardest parts of getting feedback is simply listening. Everyone's nature is to defend. When I get feedback I nod, listen, and try to never sound defensive - even if the feedback feels wrong at the time.
I am working on a new product, my idea and implementation from start to finish.
Yesterday I asked my spouse to use it and tell me what she thought. Anything she had an issue with, I was like a crab - just claw claw claw. One has to resist the impulse.
One of the best ways I have found to resist the impulse is to own all feedback. If your wife has an issue with something it's either a real issue or you failed to communicate it properly or it's a combination. My wife and I have a relationship where I explain something and she has issues forcing me to rework communication, the something, or a bit of both. Ends up being very helpful.