Since I joined Plusnet I have had very consistent speedtests, with almost completely flat lines on the graph, e.g.
http://www.thinkbroadband.com/speedtest/results.html...
When I was on Infinity the graph jumped up and down like mad, especially the HTTPx1 test.
Consistency in the Plusnet test is probably helped as I am on 40/20, synced at 50 with available speeds well above 70.
I had 80/20 on Infinity, so the bouncing HTTPx1 test still usually averaged above 40.
I just tried the other test at
http://labs.thinkbroadband.com/speedtest/?site=omega
and the upload on that zigzags like mad, though keeping pretty much to the same overall speed
http://www.thinkbroadband.com/speedtest/results.html...
Probably not really significant, and maybe just due to different sampling/smoothing on the result data
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Recently moved from BT Infinity 2 to PlusNet. Very happy so far.