Just thought I'd start a thread to see how many people have upgraded to v5 and what their experiences are.
I'm hoping to do the upgrade in a couple of weeks, just need to schedule the maintenance window.

oh well, looks like I'll have to reply to my own thread!

We've just upgraded to 5.0.79 from 4.3, the upgrade was simple enough and didn't have any glitches.

It's good to see we can use HTTP1.1 and host headers for health checks now, this allows us to force host headers on the applications behind the load balancers and improve their security.