When I first purchased my Windows Surface Pro, I also purchased the felt keyboard. It was reliable for the first year; however, it quickly began to lose sensitivity to touch. I needed I better keyboard, so I simply ordered a used type surface cover since new ones run for about $120.00.
My new keyboard works far better than I thought it would. I actually enjoy writing papers for school.
Just because it is a used item with a little wear doesn't mean it is poor quality.