Flashlightreviews.com has a good
review of the Striker VG.
Says overall output is 62 by his measure, which is generall accepted on CPF as a 1:1.4 to actual lumens, so 62 x 1.4 = 86.8 lumens.
I've never used the Gladius, though I think I would like it. The trade offs are you have to have the Gladius in the tailcap position/mode you want for your situation, while the Striker has all the modes available at any time with one button - just that it still takes about as much time to get to those features.
The Gladius is faster and slightly more versatile once you are in the right mode. The Striker has more throw, but the Gladius has more spill. - Depends on what you want. The Striker does have more than two levels, I count six, but the lowest is not as low as the lowest Gladius low.
I once did a runtime with 700mA 3.0 V RCR123's and it ran 24 hours on lowest level. That would mean 48 hours on CR123 primaries.
I keep my Striker in the car as my compact super thrower spotlight. More versatile than my second choices: either a Inova T3 (single level with less throw, but more runtime on high) or a 2C Mag LED (single level and bigger with more runtime & I think more throw).
I like mine and think it is a good light for $110. But of course I'd jump on a Gladius for that price too.
http://www.flashlightreviews.com/reviews/ledlogic_strikervg.htm