I have been using 5800 for a few days now. I am still learning how to customize it to my taste and I am learning more and more about it.
Garmin GPS software works today, finally. It took about 10-15 minutes before it was able to pickup the satellite signal. I was waiting for a bus at the time, I open the software and let it search for satellite signal while I put it back in my pant pocket. When I took it out again, the map was loaded up as the signal was founded.
It was said on the 5800 community webboard that it will eventually work faster the more often you search for the signal. Hopefully that will be true.
I have also loaded up new themes and applications. One of which give the home page a new, more useful looks. I certainly prefer this *shell* over the default one.
Like many other 5800 owners, I am waiting for the new firmware to be release. Somehow only a few people were able to get it. No one seems to know the official release date though... Only speculation, while other countries for their update already.