I haven't done so yet, but I've considered it. Frankly, I don't drive the Zilla that often to justify the cost when I have a bluetooth earpiece. There are other things that money would be better spent on. But this deal was FAR too sweet to pass on.
I did find out today that many of the internet retailers in the 400-500 dollar range are selling 'B' grade decks. A grade decks are sent to regional distribution for professional install. Which is what I purchased. They're rated and categorized by JVC based on audio/frequency response/specifications.