i've a bit of experience with things that glow--especially glowsticks.
Re: Krill -well constructed, but even the Extreme 180° has relatively dim output-(IMO) suitable as marker only. Also the 2500hr. El panel life should call for at least a 6 month warranty instead of the chintzy 3 month one they offer now. I has serious reliability problems with all three of them -that I had 2 years ago. For the money, I expect more.
Re: Glo-toob-much better brightness, but uses a 12v. alkaline (one use) that might be hard to find in certain areas. Also the Glo-toob is $30. or so.
For the most serious use I recommend the Canadian made Lazerstik--$12.U.S. and runs on cheap button cells for 20 hours.
Rugged construction and waterproof.
My other Favorite is the Korean made Gilla sticks that allows for battery replacement (3 X 357/LR44/76).
Those batteries are as cheap as 10 cents each, on the internet. You can also use the NiMH H40 rechargeable buttons to power the Stick. For waterproof use, just put the stick in a heavy duty clear freezer Ziploc bag. There was a group buy on these sticks awhile back and a few of them should still be available to buy.