The best thing about level up translation is that they do not charge you for any work done during testing, so even if there are some typos or other errors we can't find before release it's free! They also provide excellent support with all questions related to their services (and sometimes beyond).
Sometimes I have issues finding an answer when contacting them through chat but otherwise everything has been good thus far :) We're currently working together regarding localizing our mobile applications into Spanish language markets which include Latin America as well Europe / Middle East region - where most people speak English natively anyway ;).