Head winemaker Francisco Baettig said: "As a result of small-sized clusters and berries, as well as cold conditions, Aconcagua Valley red wines show a fine aroma intensity and good fruit concentration.
"Both Merlot and Shiraz exhibit very high quality, with great fruit intensity and a first-class tannic level."
Carmenère wines showed "a first-rate balance between ripeness and liveliness," he added.
In whites, Chardonnay was expected to be "heavier than the elegant and fresh 2007", said Baettig, while Sauvignon Blanc was "less aromatic" and rated "good to very good".
Total grape production was close to estimates made last December, and 12% up on the 2007 harvest.