Keep launches as an open beta.
There may be a waiting room depending on how many Keepers are logged on.
It's fast and easy to use once you're in.
Graphics and animation can always be upgraded by the Keep staff later.
The Keep's function is self-explanatory, but there's also a tutorial hidden in the "list" looking icon in the top left. Click to make a side panel shift out. The tutorial is in there along with other options, such as to see the achievements that carried over.
The Keep works by having your games upload your achievements and data to the BSN servers, and then the Keep accesses that information to load into itself. The Keep does not load your game choices. You will have to select the game choices manually. Hints are provided to refresh your memory. Finally, you save all that by exporting your save state to Inquisition. You can make multiple world states and are in fact encouraged to do so. You should also be able to share your world states with other Keepers.
Also, some of your Heroes may not import because of some glitch. Something about x's in the character's name or profile. This might be fixed by now though.
There are choices that were in DA:O/A are not present in the Keep. These can be added in the future at any time.
There are some storyline conflicts that should not be, and there are options available that should present conflicts but don't. So, still some bugs to work out.
Also some storyline mistakes. One tile says you told Bann Sighard about his son being tortured, but in the game it was the son who told his father himself. Another says Kitty killed Matthias, which never happens. It is the Warden who kills a Kitty-possessed Matthias.
I'm sure more will be added over time and it will just continue to improve. I recommend using it. Believe it!
That about wraps this up. Be sure to check out the Keep to see the options and hear Varric's telling of your story.
Some people are having trouble logging in. Read this thread if you have any trouble. http://forum.bioware.com/topic/516923-how-to-troubleshoot/