their website as "A highly pigmented eye colour that goes on creamy but dries to an intense, vibrant finish. Long-wearing, colourfast. Creates seamless coverage without weight or caking. Blends smoothly over the lids. Cream-based, can be mixed with M·A·C shadows and liners." Personally, I use these as either a base for my eyeshadow (primer so to speak) or on their own as eyeshadow. They help shadows look more vibrant, which is great.
Currently MAC has 10 permanent paint pots listed on their website. They come out with new colours here and there with limited edition collections. For example, with the Cham Pale collection they had new paint pots, I purchased two of them, but turns out they were too gritty and shimmery for me and I ended up returning them. All 4 of my paint pots are part of the permanent line.
Would I recommend these? Yes, I love paint pots. I would suggest getting a sample from a MAC counter, and try some out. I also have a small collection of Benefit's Creaseless Creme shadows, which are great too (and carry more permanent colours), some people prefer those. I like MAC paint pots more, I am not sure why though. Which do you prefer?