My recollection is that it tastes the same.

I like have Starbucks here and make a habit of dropping in whenever I'm in another country. I also like to collect the mugs from each city/country.

In 2008, I went to the one at Alto Palermo (which might have been the first in BA?) and it was an insane wait - 30min+ just to get inside the store. My observation at the time was that it was 90% teenage girls - leading me to to believe it was more of a trendy thing. On the last trip to BA, i didn't see nearly the same queue at the Starbucks.