Refer to Lux, please wait a while and I'm sure will post more details next week.
About SideKick switch, it offers direct control over brightness but the length of flashlight will be extend.
As a 2xAA, we have to consider the length and more.
Vantage is a tool-light while "Signature-T" needs more features to be a tactical light.
Ricky - Lumapower CS