I give a big thumbs up for I'iwi ukes. After listening to it online at HMS and loving the sound, I bought a redwood / mahagony tenor from HMS earlier this year. I really love it. Met Corey Fujimoto one time and he played it a bit and he made a comment that it sounded almost like a guitar. This is with wound Low G string, so does give it a real warm full tone. And it is pretty loud. The tone, feel and playability are what really make me a big fan of I'iwi ukes.
I realize that sound and tone are subjective and some dont want a guitar sound in their uke, but I love a deep full warm tone. But I also enjoy other types of sounds/tones too, which is why I also bought different types of ukes. I will have to try some lighter strings on one I'iwi just to see how it works with other types of strings that give a little different sound.
Yes, some may or may not prefer the oil finish, rather than high gloss, and some may not be used to the different look with the 3 sound hole design, but the unique style grew on me and now I really like the unique look. But, more importantly, like Andrew mentioned, Charles builds first and foremost for tone.
Charles said in his video for HMS, he is trying to make that uke that people keep wanting to pick up, due to the feel and connection you get from the uke. And he said when you get serious about ukes, sooner or later, things that were important before may not be as important and a lot of people start to look for tone and playability first. And these are the people that custom instruments are made for. I do keep picking up his/my I'iwi uke and the tone and playability are what I love most about it.
Charles Interview and concert uke played by Corey -
https://vimeo.com/120341571
Here is one of the tenors I bought played by Corey -
http://www.theukulelesite.com/i-iwi-redwood-top-custom-hawaiian-mahogany-tenor.html
And probably no better endorsement than going out and buying another. So, in another batch that came in, I really liked the sound of a redwood/macassar ebony tenor and bought a second one. Love it just like the first one. I only wish I could make the uke sound a fraction as nice as Corey Fujimoto. And being able to buy them from HMS is always a big additional plus that helps insure a good experience. So, consider me an I'iwi fan.