Came back through Ezeiza on Wednesday with 4 bags stuffed with goodies from a trip to the UK and Canada. Nothing excessive, a few electronic goods (Bluray player, iPad, Kindle) a whole bunch of kids toys and clothes and some foodstuffs (bacon, baked beans, sauces etc).
My bags were x-rayed and I was waved straight through. I'm not sure if the fact that I was traveling alone with my 4 year old gave me a free pass, but I didn't see anyone else getting their bags emptied either. They seemed to be letting everyone through, even those carrying big flat-screen TVs.
Wish I'd brought more now!