I'm giving it a "good" rating with some reservations. Yes, the product does work: it fits into my older Keurig without a problem, is easy to fill and clean. One major frustration was removing the "Attention" label on the filter. Why is this not a "removable" label??? It took a lot of elbow grease to get the glue residue off of the filter. Ridiculous.  
Now I'm in the "trial and error" phase of determining what grind of coffee works best. Regular isn't it, so I'm thinking it'll take a fine grind or learning to grind my own beans. It would have been helpful if Keurig included advice about this. The statement on the box to "use your own gourmet coffee" is enticing but not helpful. Hopefully, I will get the hang of this soon and make those great cups of regular and decaf coffee - and stop using plastic, non-recyclable K-cups. That is the object of this whole experiment!