I'm actually surprised at the amount of wishing and wanting going on. Let's be realistic. The 442, when it came out, was a game changer. And it's cost was a little over a thousand less than the 664. Yet, compare the 2 and what you're getting(granted it was years ago and technology has made leaps and bounds). The 552 is a thousand less and compare it to the 664 and how many more options you're getting with that minimal cost increase. They released a phenomenal product for a great price and people still complain. I think SD has hit it out of the park with the 664.