I started hunting Ur around generation 180, and I have been checking these threads for health updates, but after reading the posts in this thread it occurred to me that I have just been lurking without ever contributing.
Well, I made a forum account so I can help provide updates.
I am only level 95 or so, so I don't do much to the online Ur, but I still have been trying to fight him at least once a generation for the pity rewards.
Anyway - just a heads up. I'll post a health update as soon as I do another round with Ur.