I've got the Gamma and tested it out with my Myo xp (2008) last night.
If you want to try out running at night its a cheap way of doing it.
Its not as bright as the XP it is a close call though.
BUT it has a very tight beam,
you can't pick out a line ahead and see where your feet are going
The beam width of the xp is over four times wider at 10m, when using the Gamma your field of vision plummets I can't believe anyone who uses an XP would use this on its own
Using it
with the XP was a different matter though as its circle of light is very "clean" great for picking out the line ahead while the XP with the diffuser up was used for the closer stuff