Since each string is doubled, with the third and fourth pairs tuned in octaves, this is the ukulele equivalent of a 12-string guitar, and serves a similar function. These 8-string tenor models deliver a full rich sound that's great for backing vocals, for instance, and you really don't have to play anything fancy to sound impressive.
These HF-38 model Kamakas are strong and stable, and there are other ways to tune them to get a different sound. For instance you can tune it "low to high" with each pair tuned in unison, or you can double the traditional high-strung 4th string to really emphasize that high drone-string sound. The ways you can utilize the extra string capacity of the 8-string Kamaka uke is only limited by your imagination. Schaller mandolin tuners with a high gear ratio allow precise tuning.