Yeah I upgraded to it 2 days ago as i'm having bizarre issues with my windows machines and the Win10 networking bug so using CQC for zWave isn't working out.
Alas after all the hype, NONE of my multi-button controller devices which were promised to work in 5.x now work. Not sure if there is any additional functionality, but since i use CQC's logic engine as it's more powerful I don't really need anything else other than device support.
I gave batwater my extra ISY, I know he's got a ton of newer zWave devices, it'll be interesting to see if the ISY can support them or if it's another 3 year wait there.