I have done.... but don't overlook the fact that that I set up f8lure to check the packet loss that I was seeing through the Thinkbroadband BQM, which is that some days there is almost no red, other days there are huge blocks of it, if it was down to the router I'm sure the red packet loss "blocks" would be a consistent and daily feature.
The BQM graph was just as "noisy" pre Fritz when I had a HGV2700 on ADSL/ADSL2+, it was worse on Enta than when I moved to Vivaciti for an LLU service from Enta/IPSC, and returned when Vivaciti moved me back to WBC/Enta (BT had suddenly upgraded the exchange to WBC after TalkTalk arrived) - I should have dumped Vivaciti then