Not making as big a difference for me, looks like the faster the machine the less of a skew it creates:
*Note* None of these were done on VM's 50mb, just illustrating the effect of Kaspersky.
With Kaspersky:

Without Kaspersky:

---------- Post added at 16:45 ---------- Previous post was at 16:38 ----------
Quote:
Originally Posted by roughbeast
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Heh, that'd been me. Did another test today:

Doesn't seem as terrible now, but the results are still wrong - it's reporting upload speed over double the actual rate it's uploading at, and the upload is very bursty during the test.
I can confirm what Igni said, it's hosted on a 100mb connection and cannot reliably test more than one 50mb user at a time and zero 100mb users. Given that, I'd say it's OK to use for 50mb testers as long as it's repeated once or twice.