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Quilted maple is a gorgeous wood! Maple typically is classified as a "bright" tonewood (emphasis on higher frequency sounds). As long as the top is thin (which it probably is; a lot of quilted maple is used as a veneer on standard custom guitars), it should sound great.
Here's some quilted maple tops and backs from various guitar sites and Wikipedia:
A quilted maple topped uke should sound bright and clear, and be just fine. Went to the OokOok website; he's building these out of some very nice tonewoods. I don't see how you could go wrong with one of these, IMHO.