Same here 10.5 works great
However, for some reason my Ultra has reverted back to 10.0.0 and the problem is back, I have done a factory reset and its saying that 10.0.0 build 4209 is the latest update. The sound problem that was fixed for a while is now back again, this is ridiculous !!
Luckily I have another Ultra and I removed the network connection to stop it updating so this one is still working fine with the 10.5 update.
I hope this all gets sorted out again soon.