I don't have any first knowledge of Ko'olau sopranos, but I can vouch for the seller. I purchased a Kamaka 6 string from Vicki last month and it was in excellent shape and fairly priced. I was lucky enough to be in Northern CA at the time and pick it up in person and while there she showed me several of her ukes. They were all well cared for and most importantly, Vicki's a super nice person. Very easy and enjoyable transaction. This Ko'olau soprano looks like a great instrument. Good luck with the sale, Uke Mama.