I have had it for a little more than a year. The XM satellites are
located to the south of my Chicago location, so if I fly north for a
while, I lose the weather unless I relocate the antenna (I have it
velcroed to the top of my visor).

Because of their need to make this run on multiple pdas, quality
control is marginal, so never be the first to download a new release:
if what you have is working, stick with it.

I also like having it on a pda because I can use it for other things,
and the screen is clear and reasonably sized.

I have occasionally been frustrated with XM timeouts. Garmin 396 has
had some teething problems also - magnets in the antenna, bogus terrain
warnings, etc. Actually, I don't see any sense in terrain warnings in
a non-ifr GPS. If it's not IFR rated, you should not risk your life on
it.