the older sl series was much better. I've only been using them for 4 years and I have three that i've purchased over that time period. My first is still my go to light. The only problem that it has was the ceramic around the bulb always decomposing (easily fixable by using a standard eraser meant to go on top of a pencil... just cut off the tip and stick the remaining cylinder eraser around the bulb to hold it in the reflector. The newer lights however are using really thin metal that just cant stand up for use as a hammer. (I'm afraid to try wedging the new ones)
Pros: common light easy to charge anywhere, mostly low maintenance
Cons: thinner metal than previous editions, knurling is more shallow, and the ceramic around the bulb still breaks easily
This review was written in the old system and had content requirements that are different than reviews written today.