According to Mya Moe's site, mango's sound is on the warm side of the "warm to bright" scale, but closer to the middle than koa. This is a range I personally find quite pleasing. I had a Mya Moe with mango top, back, and sides. It was a wonderful instrument. I bought it on Gordon Mayer's strong recommendation. He said he found mango to give him the most consistent sound, that each mango instrument sounded very much like the next (and I found the sound of mine to be beautiful). It was always very clear sounding. It's dynamic range was very wide. Played loud, it never sounded harsh. And played very quietly, it was always a quite colorful sound, but not at all muddy.
There are those who claim mango has a tenancy to fail (to split or crack). It must happen, but some of the most reputable luthiers use it and stand by their mango instruments. Pono is owned and operated by the makers of Ko'Olau ukuleles, a builder with unimpeachable reputation. I doubt you will find anyone who claims they will not make sure you are very happy with any Pono you buy. Possibly the best customer service in the business. I say buy with confidence.
and happy hunting.
