I have some exposure lights - the joystick and the maxx-d. I used to use Fenix P3Ds on the bike, and I'd go with GrasB's comments. The Fenixes were much better value for money, but not as reliable as the Exposure and harder to use.
The exposures have perhaps the best and quickest light release around, IMO., whilst the Fenix on the twofish lockblock takes longer to release. The Fenixs were much more vulnerable to vibration, sometimes turning off, and don't give any battery life indication, unlike the exposures.
That's not to say the exposures are perfect either - a minor niggle I have is that the charge plugs seem to have a loose fit in the charging port, and it's a bit of a fiddle to get the auxillary light powered by the charge port.