In my opinion, if you hear anything bad about a product, especially a $1000 unit your going to be putting in your beautiful Z, you should not research it more or take a second look, and maybe decide to give it a shot. $1000 and your Z are a lot to gamble with. Stick with what has said to work time and time again. Kenwood seems to be the best and most reliable head unit you can buy right now, at a good price, with no one at all complaining about them. Maybe pioneer will produce better products in the future, but for now, do your Z a favor, buy a respectable good quality product. The 370z is no saturn sky or honda civic Si, spare no expense...
...just my .02
P.S. go to amazon and buy your headunit off there. I've been looking at headunits too and am thinking of going with the Kenwood DNX6140, BestBuy.com sells it for $950, but at amazon.com you can get it for $698, plus they give you good deals on ipod cables and backup cameras and PAC converter for steering wheel controls at good discounted combo prices.
or you can go with the newer Kenwood DNX7140, bestbuy.com $1,599.99....amazon.com $1,059.99!!! (Note these are all brand new in the box systems, and amazon.com being the largest corp on the internet, you know you wont be scamed at these prices!)
Hope this helps!