Thanks, but I have a set of those already. They're really good in a lot of ways, but the one thing I don't like is the wide, relatively flat bottom. I find they develop a lot of issues with sputtering and the like when the paint level gets "low". The conical metal cups work to the last drop because the paint volume stays the same shape as it drains. With the shape of the Testors cup, they start to sputter well before empty because the last bit of paint is spread out flat, so suction can break surface tension and draw in air bubbles, and/or a minor change in brush angle can tip the paint away from the feed hole.
This leads to some frustrations with my Micron in particular. If I use the smallest cup (the volume best suited to the kind of spraying I use the Micron for), something like last 1/4 of the paint in the cup is unsprayable, so I have to overfill to compensate, which forces me to use the cup lid as paint sloshing is REALLY easy with such a shallow cup. I don't like using the lid because putting it on and taking it off is awkward and makes the whole process feel less smooth and efficient.
If I step up to the medium cup, then the amount I have to overfill also goes up. I don't have to cap the cup, but I end up having to spend a lot more paint in the cup than I intend to spray, just to keep the cup working optimally.
I'm interested in the cup linked because it has the same benefits as an Aztek style cup over the stock side cup (simplified paint path for simplified cleaning, holds the entire paint volume above the needle like a gravity feed), but with a rounded bottom that will do a better job funneling paint to the feed tube as it drains.
I don't mind that it's a C sized cup when I'm mostly using B-A paint volumes, as the better bottom means I can actually fill it to taste, unlike the Aztek cups.