ecwkwok

For old guys like me who doesn't have good eyes...

I'll stick with my Microsoft Street & Trips + Receiver + Laptop....

13" vs 4.3" display...
Same Price (On sale $99.00)
Easy to travel with (have to bring my laptop for business trips anyway, the receiver's size is similar to an ipod shuffle)
Touch screen control (My laptop is HP TX1000 series)

ecwkwok

But..... is it possible to put your laptop on the dash, or need to put it beside you (on the passenger seat)?? Not too practical wor?!

I don't think you can put anything with 13"screen on the dash...I tried my friend's Eee PC with 7" screen and navigation system; yet I found it was really hard to read the maps...
Usually I travel alone, so I'll put the laptop on the passenger seat.
Or you can get a car laptop mount lor. . . (~$50)
Again, for guys without good eyes, I think it will be a better alternative.

ecwkwok

The good ones will remind you ahead of times which streets to take ga mah.

I don't think a GPS can pronounce EVERY street name in the city. For example, except for those main roads, my GPS can only tell me "Turn righ in XX KM", "Take exit number XX" something like that.