And to many no, I had the NAV system in my 2010 GT500 and 2010 SHO. I decided against it because it isn't worth the coin. Sure it works pretty well but is becoming extremely dated. Many of the nice features are tied to a Sirius subscription as well. As for the Shaker 1000 it's only recommended for someone that doesn't plan on changing the audio system that needs more bass.
That's why I chose not to get it this time around also....I put the money into the PP and TP instead.