Squeezebox,
Here is the real deal about vent liners. The white lightning might be a little bit faster, but not that much faster that the difference can be discerned by the human mind and ear.
The difference in ignition time between the WL and other vent liners or even a simple drilled and chamfered vent hole is in MILLISECONDS and is imperceptable to the human ear.
In scientific tests the WL vent liner is more consistent in that the ignition times of multiple ignitions are closer to the same time than multiple ignition times of other vent liners. This doesn't mean that the other types of vent liners have more misfires, but just that the ignition times vary more. The varience in ignition times with the other vent liners is, once again, in small amounts of milliseconds.
I have flintlock guns with standard 1/4-28 vent liners, 1/4-28 vent liners that I have cone out the back side before installing, stainless steel allen head set screws and a few with simple drilled hole vents. They all provide consistent ignition and since any ignition time is in milliseconds it doesn't make much difference which type vent you use.
If someone is experiencing misfires it is easy to blame it on the type of vent, but I always suggest that the vent hole diameter needs tweaking or there is some other problem with their loading and shooting process not the actual type of vent used.
Randy Hedden