I happen to have an Island Ukulele soprano. I purchased it on a trip to Kauai, to play at my friends wedding.
Thread is here -
http://www.ukuleleunderground.com/forum/showthread.php?29926-Back-from-Kauai-Island-Ukulele-acquired!
Now for me, to purchase a Kauai built ukulele, and play at a wedding on a Kauai beach, was awesome.
Regarding the ukulele itself, I purchased at Scotty's, and was looking at Kamaka's etc. This one stood out to me as "The one" to have for my friends wedding, due to the local production, look, and it plays pretty nicely.
That said, I have 9 ukes, and this is not my fav to play. It lacked sustain, so I changed strings to a clear KoAloha set I had around. This helped things. It really does sound like the one in the comparison video posted earlier in this thread. A bit "plucky" on the high strings... The size is slightly larger than a standard soprano, and it sounds it. Mine is Mohagany with a Koa front and Fretboard. It is a very nice looking uke. I am very impressed with the workmanship, and it seems to be finished as nice or better than my Pineapple sunday. It's a looker for sure.
I also paid closer to $400 for it, and not $600. So I felt it was a good deal for what I was getting.
Would I buy it again? For my intended purposes, yes. I enjoy having it, and the memories it brings me. Do I play it often? Not as much as some of my others, but I do like having it in my "stable" of ukes. Would I purchase the one on ebay? Probably not.
Cheers,
Skottoman