I have the PS2 Run flats, they are FAR superior to the Bridgestones in everything except steering response. They even ride better than the set of NON-runflat goodyear all seasons I ran for the winter.
With respect to availability: There are currently none in stock or in reserve nationwide. Michelin has plans to start a production run sometime early summer, so you should start seeing them JUNE/JULY timeframe.
They are worth the wait.
see my post on there here: http://www.e90post.com/forums/showthread.php?t=129738