I have 10080 on my Lumia 830 right now. I've been running it for a couple of days. I did an upgrade over 8.1 PfD and did a factory reset while on Windows 10. At any time, I've not yet encountered the Start Screen loading issue that others have reported on other devices.
I've been having issues with installing certain apps from the Store (beta Store and the usual one) though. I was able to install WhatsApp, however. Apps like Skype, Appy Weather, OneFootball, etc have issues with installing. The progress bar shows the downloading part but errors out when the installing part comes up. Not a lot of random reboots though. The phone did get heated up in one occasion, but I was not able to determine the cause for that.
By the way, the new Office Outlook and Calendar apps are excellent. I've synched them with my corporate Exchange account and it works quite well. I've yet to encounter any bugs in those apps.
If you guys want any app tested, I can do that for you. For now, I've set up GB locale on my phone.