Jonathan Goodish wrote:



I'm not sure what ADS-B provides as far as weather, but the XM service
is pretty comprehensive--I doubt that ADS-B will provide all of the same
information.

You're right, XM provides more, but not $30 more per month, much less $50.



In addition, ADS-B doesn't provide an entertainment services like XM
radio, for those who might use it.

I have an XM radio in my plane now. Although XM in the 396 works it is
a secondary function and as such is not all that convenient to use.



I'm not sure how ADS-B is delivered, but my guess is that it won't be as
portable or versatile as the XM service.

It will be delivered by many hundreds of ground transmitters and will be
available in handhelds like the 396 as well as PDA's. Versatility is up
to the software designers. I would expect it to be the same as the 396.