I can attest to Zebrawood being fairly brittle. I had a zebrawood pick in my pocket today, dumb I know, and it broke in half along the grain. So, that really sucked! As for Zebrawood and Goncalo, the more I've looked in to it, the less I think I understand lol. What seems to make sense to me is that they are not the same but are similar to "cousins", as Zebrawood is predominantly from Africa and Goncalo is mostly from Brazil. From hence forth I won't use the names interchangeably as I had been, just in case.