I see absolutly no reason to upgrade to this new model. If I had reason it mainly be the size of the unit. I just came from Dell's page and the checked out the specs.
Length 117 mm (4.6 inches)
Width 77.2 mm (3.0 inches)
Height 14.9 mm (0.59 inches)
Weight 136.5 grams (4.8 oz)

Almost exactly the same as my X5.

What's up with that. Not to mention that you'd probably want to buy a new cradle. If I purchase a CF wireless card, I'll have almost exactly the same thing! Ya know... some times I REALLY don't like Dell.