I bumped into a fellow tog today at Leicester Cathedral who was sporting the snazzy Quattro, we had a chat and he let me fondle his wares....absolutely sublime piece of kit, forget the looks it is by far the best single handed shooter I have ever used which is where he had also fell in love with the camera, he couldn't really say IQ wise which was better out of the Quattro and the Merrill(which he also owned) but it was a given that the Quattro was better to handle..
we are meeting up in a week or 2 for a walkabout and he said bring a spare card so I can use the Quattro and take the images home with me, jolly nice chap.
initial feelings are handling wise I prefer the Quattro hand down, but I wouldn't be paying much more if any over the price of a Merrill.