I've taken a few things back to AD that didn't work properly. I've had absolutely NO problems as each time they verified the problem and promply gave me a new replacement.

Now, I haven't simply tried to just return something, but to me that's a different issue than a defective item.

Ditto what Richard said on pumps...Buy an Ehiem if it'll fit to your skimmer, Mag drives aren't the best pumps.

TT