How to Choose a California Cabernet under $20

In this video Gary has pulled the 6 top selling California Cabernet Sauvignon wines under $20 off the shelves (2003 Stephan Ridge Cabernet Sauvignon, 2003 Twenty Rows Cabernet Sauvignon, 2003 Trentadue Sonoma Cabernet Sauvignon, 2000 Douglass Hill Cabernet Sauvignon, 2003 Simi Cabernet Sauvignon, 2003 Hess Select Cab Sauv) and is tasting and reviewing them for you. Are they popular for a reason? Or should you save your $20 for something better?