The algorithm has me in it’s clutches. It knows what I like. It knows what I’ll impulse buy. EVERYTIME. I impulse bought then waited for almost 2 weeks for my package to arrive.
Inside were 4 packages of SeamiArt thematic watercolor sets. each one unique- skin, morandi, candy, and ocean and forest. Each set has 12 half pans set into a plastic holder which was then set into a card sleeve. The sleeve has no information about the colors or about the paint. Nor does the listing.*
To get started I’d classify these paints as firmly in the adult coloring sales demographic. They are also dupes of a brand called Prima that makes similar themed sets. These dupes are all over the place and available from MANY other brands. Seami just happened to have the cheapest set available on Aliexpress.
I’m not generally a thematic set kind of person, BUT I wanted to see how these sets performed. I hot glued my sets onto a heavy card and then into this small “nice box” to make a travel set. I also glued a sheet of yupo to the lid to make a mixing area.
In short- much like the Grabie set I have mentioned in the past. They rewet really well, have a decent amount of pigment, the pastel colors are cut with a LOT of filler that has a recognizable feel. They benefit from a GENEROUS pre-misting before painting. But overall the colors work well with one another and shades you expect to get from various colors mixed are there. The ultramarine blue mixes well with the umber to get a gray. The reds dull down the greens, the yellows mix with the blues as you’d expect. Over all as far as student grade colors go, these aren’t half bad, with a few caveats.
The pastels colors in the morandi and candy set use quite a bit of filler, and now that I know what that filler is, I know how it feels on the page. Clay** probably kaolin clay. Clay is a pretty standard filler that lends a flat matte appearance, bulks out the color, and allows for mixing of a color into something more pastel, without using something (expensive) like titanium white. It also preserves some of the transparency of the color. HOWEVER, it really impacts the flow and movement of the color on paper. 
The end results of this filler is that the paint acts a lot like gouache on paper but isn’t fully opaque. Adding these colors to other less filled watercolors dulls them down in a way that often looks muddy. These colors also feel harder to control, because they aren’t behaving as one expects watercolor to behave.
Though, if you’ve used children’s watercolors recently you’ll know exactly that feeling of clay filler. It’s one of the things gives children’s watercolors that gummy consistency and why they don’t flow around the paper. 
Which is also what makes a lot of these cheap watercolors so great for coloring books.
It does beg the question- if I add a flow agent to these watercolors will it improve the flow? 
Anyway, can you make art with these sets? I think it would be really difficult to make anything with just one set. The sets lack a contrasting color or colors that can mix to create true darks. IN order to do that you need to buy 2 sets. I think the 2 most useful sets are Skin and Ocean and Forest. With those two sets I’ve been able to get a really good range of colors for landscapes and skins. One of the big drawbacks of the skin set is that it lacks purples or blues for shadows. The other two sets area great for painting distant trees and land. The pale colors can have other colors added to create a broader range of pastel shades.
Another drawback to these sets is that you can’t get a refill of just one color. You’d have to buy all 12 colors again. I’ve been hitting the sap green pretty hard and I know it will be the first to disappear.
So here’s the big question, would I buy them again? No, but mostly because I’m not into themed sets and there are colors in these sets that I’ll probably never use. I spent under $20 so it’s not a huge waste of money. I also, outside of Beam paints, really prefer to get tubed watercolors and make my own pans.
Who do I think these are for? I think these would be a good gift for a high school artist, or if you know someone who is into adult coloring with different materials. A friend of mine tries all kinds of different materials to color their books with. These would also be great for the art journaler who wants a bunch of colors available but are on a tight budget. Even then I think the MeiLiang sets are a better budget friendly choice.
Meiliang (now owned by Paul Rubens? Always owned by Paul Rubens?) performs more like a traditional watercolor. It doesn’t have a lot of filler and rewets like a dream. I think if you are looking to bulk out a watercolor collection Meiliang is a better choice.
I don’t have any affiliation with these brands, though I do have affiliate links with both Aliexpress and Amazon, links that give me a few pennies if you buy but costs you nothing expres.
*These are now listed on Amazon for almost $20 per set. The Amazon sets do have a tin. But the sets are also available on Aliexpress with a tin for about $10.
**I recently found out that The Art of Soil paints that I bough use clay as a primary component to all their paints, which explains why I don’t like them