I have the 200L running off of 2500mAH NImH batteries from batteryspace.com. I got 4.4 hours in "low" which is still 100 lumens in 40-50 degree weather. One should get 40% increased run time with 3000mAH disposable Lithium Ion batteries.
I think the light is great and use a plastic bag to keep the batts completely dry, just in case.