What I have noticed however is that some very legit HFTers (@Jaffray - Hedge Fund Wizards and @MarcosCarreira) are being unduly lumped into the wrong crowd. I appreciate very much their willingness to engage with me on Twitter (well aware of the severe limitations to doing such we nonetheless pull it off ) in defense of HFT. To the best of my knowledge neither of these two are using expert-networks to establish special connections which allow them to execute orders which have not been allowed by the regulating bodies, such as Hide-Not-Slide. I also doubt they test their systems in the open market like we've seen before.
Side note: In the next couple of days, when I get some free time, I will address the Andrei Kirilenko findings.