Just to give you a short feedback:
Once or twice a week when I want play i am greeted with [Repair] instead of [Play].
And this really start to upset me as the repair takes forever. I noticed that if you keep the Launcher in the foreground it is faster but still about an hour. And that would be an hour I can't use the computer.
If the Launcher is in the background it takes longer. A lot longer. 4 … 8 hours.
All in all this is a real pain. And either way: I won't be playing that day. And I pay for playing not watching the launcher repairing itself.