I encountered this puzzle type the first time when test solving Serkan Yurekli's puzzle set for last year's 24 hour puzzle championship. I really liked them, although they caused more trouble than you'd expect for their size. Even though the puzzle idea is very similar to Japanese Sums puzzles, the Latin Square component in this genre makes solving a lot different though. Only later I found that the genre also existed on Naoki Inaba's website.
This is the first time I tried to create one myself. I like how it turned out. It's moderately difficult.