I don't have the navigation CD so I can't comment on that side of things.
Pros
1.) Looks very neat (esp at night) and fits in with the awesome blue and red display of the Polo.
2.) 5" display makes it viable to fit a dvd unit
3.) Adds a little to the resale value
4.) Clean dashboard
cons
1.) Can't put POI (points of interest) (i.e speed camera locations)
2.) Runs off CD so is slower than SD card
3.) Looks uber posh so is very nickable (can't take it with you).
4.) Very expensive, not just to buy, but fitting isn't easy so you have to pay for that and then possibly a navigation CD (£90.00)
Thanks to cyhliu for sending me some pics of his so I could decide to get it. Here is the unit in cyhliu's car:

cyhliu: did you get my mail? sorry if i bombarded you with duplicates my feckin email is nackered.
