Entry #5 is our favorite of the three with the bicycle. We really like the movement and energy you communicated with the cyclist and like tag line below! Can you make the e on bike the same dark blue and the e on effect the same light blue? And can you add a period after Guaranteed? Speed. Guaranteed.
Entry #4: The red in the center seems to be too much.
Entry #3: Again, the red in the center seems to be too concentrated and overpowers the grey of the "effect."
We like the simplicity, the power, and the energy communicated in entries 3, 4 and 5.