Dunnuck rates this the best Daou Reserve ever:
The 2019 Cabernet Sauvignon Reserve is a soft, supple, incredibly sexy Cabernet that brings ample cassis and blue berry fruits as well as some vanilla oak, white flowers, and spice-like aromas and flavors. It will compete with any number of impressive Napa Valley Cabernet Sauvignons and is full-bodied, with velvety tannins and a great finish.
Also Wine Advocate 94:
The barrel sample of 2019 Cabernet Sauvignon Reserve contains 15% Petit Verdot and is expected to age 18 months in 50% new French oak. It has a deep ruby-purple color and pretty, fresh scents of dried herbs, graphite, violets, crushed blackcurrants and blue fruit notions. The palate is gorgeous, with lifted, fresh fruit character and a structure that feels packed with pixelated tannins, and it finishes long and floral.