As far as I can tell kai waa and NK are equivalent quality. I have owned both. In my opinion they set the standards as far as prepreg ski construction.
I got my vega in the mainland usa through paddle dynamics, which is now based in Tennessee. The skis are made in china so I would assume they come in containers from china direct to the mainland US. There was no shipping fee attached that i paid. Lighter stiffer and cheaper than other carbon skis. So if the design works for you they are a bargain.
Current Skis: Epic v10 g3, NK 670 double, NK exrcize, Kai Wa’a Vega, Carbonology Feather, Think Jet, Knysna Sonic X
Former Skis: Epic V12 g2, Epic V12 g1, Epic v10 double, Nelo 550 g2, Fenn Elite S, Custom Kayaks Synergy