After using them a handful of times, this is what I've noticed:
-Cheap, and you get two in case one breaks.
-Exactly the same size/fit as a standard k-cup, so you don't have to remove the holder in order to use these, unlike some of the other models
-Easy to clean, and doesn't require replacement filters.
-Flimsy design, I'm not sure how long the plastic hinge is going to hold out.
-The mesh seems a bit coarse, (definitely not as fine as a traditional paper filter) as I'm getting some fine grounds with almost every cup I brew.
-Somewhat inconsistent brew strength, even with the same amount (and brand/grind) of coffee put in each time.
I wasn't expecting perfection considering the price of these and, well, they definitely aren't perfect. However, they work! All in all, these are *OK* for the price, but I'm confident that there are better ones out there. I think I'm going to stick with regular k-cups for now until I can try a different refillable model.