Having had our Prime since early December, I'll say I'm still amazed at the speed and usability of this tablet. Adding the dock in March only made it better. Here's my list of good and bad.
Wifi: Never had an issue with wifi. Getting better up and down speeds than my rooted Evo 4G. Tethering to our phones makes this an awesome experience even while driving down the road.
GPS: Although some made a huge deal of this in the early days, I never saw the need to use this device as a GPS navigational device. Updates have improved the GPS as well and you add the GPS dock and its even better.
Speed: Highly impressed with gaming, browsing.... you name it, I've played it and I haven't seen any sort of slow down at all.
Battery: Pretty good battery life by itself but then add the dock, I can go 3-4 days without charging. This is with wifi on 24 hours a day, 7 days a week. Not one complaint about the battery life.
Usability: Having transferred 7gb of video from my video camera in less than 12 minutes, I'm happy to be able to watch any video I've recorded. It's nice to be able to use this tablet in various ways and it still makes life a little easier.
Dock to tablet hinge: Getting loose but still usable