Well I can tell you one thing, repeat loops work. I had one setup that ran out of control every 300ms such that it totally wedged the hub. I managed to delete it, but rebooting the hub was the only way to make it responsive again. This is the kind of thing that didn't sink you under ST. You just wasted a lot of their resources, you didn't saturate your hubs processing ability.
I've also run into things that were working in ST but are not working under WebCoRE hubitat. I have a piston that updates a global variable and that seems to be working intermittently. I have another piston that saves state to a global store then restores. That one seems to save fine but the restore fails. Again, was working under ST.
It's making me wonder how we can make this more stable, and also incorporate upstream changes on a more regular basis.
Is there an official maintainer of this project?
A process for applying the patches in a nightly build or something?
I can help with that if anybody is interested.