Arnet, funny. Ordered Arnet about six months ago. Got a modem from their outlet and am still waiting for service. Call every once in awhile just for the hell of it, "still working on it.
Did some experimenting with my slingbox account. Had a friend in Brasilia log into my sling box account in the USA to see what kind of download performance he was getting, solid 1.8 mb. I log into account 5 minutes later from Argentina and lucky to get .6mb. Know it is not all that scientific, but my conclusion is, bottleneck between Brasil and Argentina. Within Argentina, Fibertel performance is great. Internationally, it sucks certain times of the day. My experience.