If the lowest setting on the SkyRay is 3000 lumens it won't be much good for daily use, I expect.
Selfbuilt, one of our small cadre of trusted CPF reviewers who handles more flashlights than most of us put together perhaps said it best when stating that knock-off manufacturing often has quality control issues, along with significant variation in the overall UI reliability and ease of use.
Paying for the TM15 guarantees you a quality product....I don't feel you'll be sorry about paying a fair price for this solid performer. The i4 charger seems good value as well. I notice on the Flashoholics site you can buy a nice DC charging cord for this light, whereas the Nitecore website doesn't even list it as an accessory.
I got my TM15 yesterday and took it for a midnight walk in the woods and was glad I had it. We have cougars here and when I doubled back I saw fresh tracks across mine heading in the same direction, so it was comforting to have a light canon in hand on the way home....got me to thinking I'd use the strobe if it came down to claws and teeth.
I frequently compared it to my ZL SC600 on max output and there is, as you would expect, a world of difference. The TM15 is a solid little brick and a bit heavy for regular belt carry, but I'm sure it will find a useful place in your home. I'm glad I have one.
I'm thinking NiteCore would be smart to bring out a three cell version and reduce the overall diameter and length. I would be very interested in a light of similar output with reduced run times to gain real portability, so either the TM11 or the TM15 could be reconfigured as a three cell 18650. Now that would be one tiny light blaster!