I'm not interested in higher resolutions. It's just through DVI-D, even at native resolutions the picture is much sharper than you get from the ECS. I have two monitors side by side with my A600 with Indi ECS running on one, an A1200T with Indi AGA MkII running on the other and the difference in sharpness is VERY apparent.
Still, the ECS is a great bit a kit; very compact, easy to fit and I always though it was actually quite cheap! Much less than I paid for my old Indi AGA MkI.