Garmin 2009
I updated from a 2007 data base on my Garmin NUVI 360. It was a very simple process, and since I am not a computer expert, I am sure that anyone with a minimum of computer knowledge could also be able to. Installation time was a little long, but with on screen prompts, you are led through the complete process.
The Garmin 2009 update included several newer roads that were not there before and many new POIs. For me it was well worth the time and expense as I am a General Contractor In a medium sized city and need to find many small and not well known areas. The Garmin greatly simplifies my life and saves me much time and flustration.
I highly recommend this update and AMAZON is the best way to get it as it is priced much better than going to garmin. The only negative is if you have more than one GPS, you are forced to buy a new update for each device, as once it is used it is locked to that specific device. Not really a problem for me, but something you should be made aware of.

dwayne
the garman 2009 map update . i installed it and found it cured some of the incorrect maps , which were on allmost evey destnation i chose. but , it still had a lot of errors that were 5 to 7 years old still on the update which i installed. conclusion it helped but leaves a lot to be desired in map corrections .is it worth the money ? not if you pay full price for the update .

Mapsource City Navigator Update
As with all Garmin updates, installation is easy and accurate. My only complaint is that this software will only upgrade one device. I have two Garmins - a Streetpilot and a 60csx for track and trail use. I have to buy two copies to update both units. It should be like some computer software - you can put it on a "desktop" and on a portable. I am sure that they can limit installation to those devices you have registered with Garmin.

Waste of money
The map update did not correct ANY of the known flaws of my earlier version. In fact, I tested the differences, and where the old version made me miss my turn going through Clayton, NC into Smithfield, the new version makes me miss the turn, plus gives a (too)late prompt for a corrective turn with the recalculation. I wish I had stayed with the earlier version. The update has not made anything easier.

Waste of Money...
I purchased this update for my Garmin C340 and i don't see a bit of difference in the maps or the performance of my GPS. I live in Houston, Texas and the GPS still can't find my workplace, my gym, a nearby wal-mart and most other things. I am not sure what got updated by this DVD but i can tell you for sure...it wasn't the maps. I have two C340s and i was hoping to somehow update both with this DVD but it won't let me. The Garmin people tell me that i need to buy another DVD to update the other GPS....well, that's a mistake i am not going to repeat...especially when i am wishing i should not have bought this one. Don't waste your money buying this update..wait for a few years till Garmin comes up with Map update 2021 DVD and update everything then....and hope they updated the maps...