So, idiot that I am, I just took delivery of a brand new 496 on the
basis that I can trade the 396 to JA Air for $1750 assuming I can
round-up all the bits. The first impressions are...

* The new XM antenna has the magnets removed!
* The GPS antenna is a new format with mounting cup.
* Voice prompt language is now selectable.
* Updates when scrolling are way faster.

More news as it comes and as I play with it...