I'd like to pick up a soprano uke and I particularly like the blue KA-SEM but I'm not sure they're still making them because they're a little hard to find. The KA-15S seems to get good reviews but I can't find as much info on the KA-SEM. The blue KA-SEMB (which I assume is the same as the standard wood colored KA-SEM) costs about twice as much as the KA-15S but I don't mind paying the difference to get the blue color. Does anyone know what the differences are between the KA-15S and the KA-SEM? Any opinions on the KA-SEMB?