I just received my Streamlight ProTac HL 600 lumen pocket light today.
Review after photo
It's a little bigger than my EDC, (see pic) and a little heavier, but also a 2 battery tube.
The strobe is about 3/4 speed of my EDC but still about 6 flashes per second so quite effective.
The Light is quite bright, but when you break the 300 lumen barrier the additional light may be overkill.
The light has a strong center spot, and then about a 1/2 power outer ring that casts a wide area of light.
If I was ever out driving at night and one or both of my headlights failed, this flashlight and some ductape would get me home through the darkest of areas.
If you wish to stop someone in their tracks, disorientate, and blind them while you made your escape, evasion, or attack, then this is perfect.
I don't know if this will replace my current EDC (Fenix PD30), at 257 Lumen, but it will be my AR-15 light.
If you need a pocket size spot light, I highly recommend. If you don't, stick with 300 lumens or less.