I got the 5000k version and it had a serious problem: fully charged, it wouldn’t hold high at all, just ramped down immediately in about 10s. After (too much) stalling, Sofirn sent me a replacement (w/o cell). Using same Sofirn cell as first one, new one actually works properly, giving about the same runtime graph as above review (it would seem, didn’t fully test). Except for this: my High (at about 3min) drops lower than reviewer’s sample - “leveling off” to just slightly above Med. level. Whereas review above levels off at almost 2x medium.
Anyway all this is telling me that although amazing value, you’re paying for it in quality control and large variation. 
Btw, if it wasn’t for this review, I’d have just thought the original defective ramp-down sample was as expected, and just standard manufacturer deception. (Which is still the case, since they state 500-Lm High mode lasts 1h13min hoping that people will think it will last, I dunno, 1h13min at 500 Lm; which it doesn’t. It’s an intentional lie.) So thx for review.