I bought this to use with our K-70.  The design is unnecessarily complicated, with three parts (four if you need the adapter) to wash.  It could have been a simple one-piece design the same size as a K-Cup with a hinged lid.  To use this, you need to remove the K-Cup holder from the machine.  If it were one-piece the same size as a K-Cup, you could use it much easier.  You have remove and reinstall the holder to switch between regular K-Cups and the reusable.

The worst part is the coffee sludge at the bottom of your cup.  The filter allows fines through, so the last couple sips need to be thrown out because of all the sludge. I will be be returning it.