Anyone try one of these puppies? I've seen 'em go for as much as $650 (!) on Ebay before which always put them far beyond my price range. The regular bi-polar Mutron pwr. supply and pedal always seemed so bulky, too much for my pedal board. Today I scored an AC one for a _very_ reasonable price and wondered of any sound differences between the regular (original) 'Tron and this internally powered AC one?