Earlier this year my Belgian Pale Ale was selected by a brewery in Seattle (Ruben's Brews) to brew commercially. For that beer I use an isolate from a bottle of Orval I have had for over three years. Because we could not pull off the logistics of increasing my isolate to 5 bbl pitching size (I'm from CA) we substituted WL Bagstone Ale yeast for the commercial batch. Although I have not tasted the Ruben's Brews version, Adam (owner and brewer) says it came out great. I am sure he would have mentioned any brett as it would be considered off for this style. If your in Seattle, check out Ruben's Brews and my Belgian Pale.