I enjoy my Keurig because it's so easy and quick to make a good cup of coffee. However I really dislike how wasteful the classic pods are. They're creating so much unnecessary plastic waste! 
The reusable K-Cup is perfect for me. I can still enjoy a super quick cup, choose to use any of my favorite ground coffees, and I don't feel the guilt of throwing away a plastic pod each time.
It took me a few tries to properly remove the pod holder to be able ton insert the K-Cup in my coffee maker as the instructions weren't very detailed. I found videos showing how to pop it up on Youtube and it's actually very easy. If you're not sure how to remove it look for videos!
I received this accessory for free in exchange for testing purposes