I have had the privilege of playing a resonator uke, although I don’t own one. It produces a very different sound to a regular uke, as well as increasing the volume. This suits some styles of music better than others. My advice is to try before you buy to see if you like the sound.
As for Kala, it seems to be a pretty reliably good brand, so if that’s what you can afford, then it should be fine.
BTW, the resonator I got to play was an expensive custom-made metal bodied one.