Just got my third modem in 3 months yesterday.
I know that many are finding them reliable, but the engineer who arrived yesterday said that they are having many problems with them...both with the modem itself AND the PSU. He said that all the faulty units are being returned to the manufacturer. I assume previously they were binned as natural wastage and only returned when it seemed that the failures were excessive.
As soon as the Billion 8200N is available, I will buy it. It makes me uneasy not haveing a spare. Much to SWMBO's disgust, I have many spares for my PCs...for some reason, she calls them 'junk' .