The only thing I have some slight trepidation about with the AAISP FTTP900 service is the new, development nature of the LNS devices; I see a few scheduled reboots in recent times to upgrade owing to SW issues - obviously there are two halves to that. One is the update itself, which sounds like a managed process unlikely to cause significant downtime as they migrate you to a different, already updated LNS over a matter of seconds. The other is the issue that they're fixing, and whether it's something that meant you might have some instability, downtime or performance degradation at other times, and the risk that the new version your moving to doesn't also have some hitherto undiscovered issue, though I understand there is a test LNS that probably has the updates deployed to it sooner and so is more likely to catch obvious issues.
I guess you could look at it the other way as a positive though, that the folk who actually design the network HW & SW are very closely linked in to the network you are actually on, and so the likelihood is the hardware if tuned for any application is going to be tuned for their network with max performance, and the chances of getting issues addressed in a timely fashion has to be perhaps higher (though maybe more likely to see issues than with a mature product).
