'If you're worried about stability, I suggest using the long term releases instead of upgrading to the cutting edge right away.'
The stable release didn't completely support using an external monitor on my video card. Seeing as I do presentations for a living, that's not so great.
'It's also important to remember that you are not a customer with a support contract with Canonical. You are a customer getting a great operating system for free. Something to factor into your calculations.'
From knowing a couple of people who work at Canonical, I honestly doubt Canonical support would consider lack of external monitor support a real bug.