I have only done the Kanile'a tour. I just did it last week. It is a little far from Honolulu, but it is pretty easy to take the bus out to Kaneohe. (Just don't do what I did and get off at the Windward Center instead of the Windward Mall...instead of walking a couple of blocks, I hoofed it probably an extra mile with my uke strapped to my back in the heat. But proof of why their customer service is so awesome, Kristen said I should have called, they would have come to pick me up.
The tour was led by Joe (the owner). He gave us about an hour long, highly informative tour. I got to see the ukes being built, and saw the evolution of a ukulele from a log to a beautiful machine. You get to see the bracing from inside the ukulele, hear all about their highly original UV protective coating, and ask lots of questions along the way.
At the end of the tour, he drilled a hole for me into my tenor and installed a strap button. I had been wanting one, but I was terrified to hand it over to a random luthier and having the guy who started the company do it himself gave me a little less anxiety.
I admit, I'm a Kanile'a freak, so I'm biased. But if you have an hour to kill (even if you go to Kamaka or KoAloha as well), you should head over there and see it from the Kanile'a point of view.
Great uke, terrific customer service, and amazing folks.