Apparently I don't know how to read...

When I ordered this I didn't even pay attention to what models this was for, so when it came in the mail I was a tad confused, until I read that its' for the Keurig 2.0. DERP. While I cannot comment on the usefulness of the larger cup, I can say that the smaller one does fit in my K60.
We typically grind our own beans and depending on how fine we grind them sometimes we have an issue with this backing up a little, but we have the same issue with the Keurig brand filter as well. However this one is much easier to use than the Keurig brand because this works just like a K-Cup, no need to remove anything for this to fit in.
While I like the dolphins, I would like to see more open filter parts so we don't have the issue with the back up (if that would resolve that problem, I'm not certain). As for the larger cup, I'll hang onto it until we need to upgrade.

*I received this product free or at a discount in exchange for my honest, unbiased opinion. No one likes things that suck.
#kcup
http://www.amazon.com/K-CARAFE-2-0-Freedom-Brew-K300-K350-K400-K500-K550-K560/dp/B014VL8PMS/ref=sr_1_1?ie=UTF8&qid=1453289767&sr=8-1&keywords=2.0+carafe+freedom+brew