Our wine expert this week is affectionately known to his followers as simply, John G. His wine blog, Quaffability is wildly popular among wine enthusiasts, which gives tips on how to pick a delicious, yet affordable wine that’s readily available. The primary focus is on wines from Trader Joe’s – the grocery-store chain that’s famous for its Charles Shaw (a.k.a., “Two Buck Chuck”) wine. We go beyond Charles Shaw to discover John’s favorite picks -- he describes his system of grading, how price relates to quality and whether or not there’s any truth to labels and bottle shape providing clues to the quality of a wine.