Are you asking if it is a good deal or if it is a good choice for your Aviator? It should be pretty easy to figure out if it's a good deal or not by simply checking your local electronics outlet or doing a quick search on the web. It's a low end Pioneer Nav, you get what you pay for.
If you're willing to part with a few more of your hard earned duckets, go for an Avic-Z3 or grab a "deal" on the older Avic-Z2. The factory available Navigation offered in the Aviator was built by Pioneer. Talk to anyone who has one and they will tell you that the GPS funtion and mapping left much to be desired.
Kenwood's DNX8120 is one of the best on the market right now. Kenwood's products utilize Garmin mapping, the paramount in GPS mapping.