guatemalan marimba

here is a 5.6 non-chromatic guatemalan marimba.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250041006023&ssPageName=ADME:B:SS:US:1

has anyone here ever played one like this. i’m curious what it sounds like with a wood i have never even heard of (hormigo) and wooden resonators. stuff keeps popping up on ebay like this and i am wondering that since the rest of us “learned” from the guatemalan traditions through people like vida and leigh… have they learned from the innovations that america, europe, and japan have produced since… when it comes to making, much less playing marimba. any thoughts…
jsb