About 18 months ago, I purchased a Keurig K-Supreme+ coffeemaker from Costco. About six months after purchase, I tried to do a regular "descale" (as indicated on the machine). I used the Keurig brand descaling solution and the Keurig rinse pods (to clean the needles). However, it essentially stopped working during the process. Apparently, this is a known issue with this model.

So, I contacted Keurig (including the appropriate serial number). They sent a replacement (minus the additional items that came with the kit). It arrived a couple of weeks later.

The replacement machine has never really worked right. If I select a 12 ounce cup of coffee, I am lucky if it makes 9 ounces. If I select 10 ounces, it usually produces 7 or 8. We endured this for a few months. However, it started struggling even more.

Now, if I select a 12 oz cup to make my wife a cup of coffee, it might produce about 7 ounces. However, a subsequent cup (for me) will only produce about 2 ounces. I will repeat the process three times until it makes about six ounces.

I contacted Keurig about this and they said that they couldn't help me because it was replacement (even though it was still within the one-year warranty). So, we just went along with it. Sometimes, the machine would surprise me and make an 8 oz cup the first time and a 6 oz cup for the second cup. Most of the time, it's still the same old, same old.

I've tried everything to fix this. I've used the paper clip to clean the needles (which are clean). I've descaled it every month despite having some of the cleanest drinking water in America (we live in Palo Alto, California and our tap water comes from Hetch Hetchy reservoir at Yosemite).

Today, I did yet another descaling. It's just as problematic as ever. And, now, the plastic has changed its color in the K-Cup holder area (which is what happened in the first Keurig K-Supreme+ issue). In fact, the coffee sometimes gives off a "burnt plastic" smell.

Hence, my question:

Can I actually return this to Costco?

Should I buy a different Keurig model at Costco?

I don't take many things back at Costco (maybe a total of four returns in ten years). I am just really frustrated by Keurig. I'm not sure if I want to buy another one. I might simply buy a different brand.

It's just that the K-Supreme+ was a replacement for another model that died after about a year (we didn't return it). Oddly enough, I had an older Keurig that lasted for at least five years before we simply gave it away to a neighbor. She was still using it a few years later when she moved.

Just got this from my local Costco for 79.97. We were looking for a coffee maker and thought this is a good deal. But after I got home and I read the reviews and they are very mixed. Especially people mention they are very inconsistent and coffee is weak. Does anyone have this and how do you like it?