the big issue i see is guarantee you'll actually get delivery. Send money to a startup company in brazil you won't have much recourse if you get a fat nothing.
Consider also reliability and service. Anyone remember diablo or the rd fiasco? Even the brazilian companies who do honor warranty you have to bite shipping to brazil and wait months on repair... Just saying. The current crop of brazilian amps definitely make rated power in a tiny package and those look pretty cool.
How does one order? Is there an authorized point of sale in the usa?