I have recently sold my CDA. I didn't really have a problem with it, apart from I thought it suffered in the heat wave. (This could've all been in my head, though (paranoid!!??)) Also, the car well might have suffered in the heat with a standard set-up - who knows??!! I only sold it as I needed the cash.
I've since bought a Green replacement element, but can't honestly say I've experienced any gains over the standard filter (other than a FRACTION more noise!)