Billion, where to start:
Pre 2009 was the same as eTec - eTec was the fail of failboats, with their poor GUI and very temperamental power boards which were prone to overheating, in early 2008 there was a court case which they lost, allong the lines of, the modem got so hot it melted the paint on a window sill and stained a £33,000 painting which had to be paid out in late 2009, at that point Edimax bought Billion and they then Slightly improved, the WiFi Range was poorer than poor, the early Billion had issues with Throughput and dropping packets.
All that said, the models for 2010 have greatly improved, Yes, BUT... Far from in the same league as the likes Linksys never mind Draytek.
Having installed over 200 Billion and way over 300 Netgears (in previous employment) i found myself returning to the clients with the Billons with a replacement after a while, for reasons you could only laugh at.