I used one as a primary until I replaced it with an edge morph. Now it's a very nice backup. I've seen a lot of divers with large "traditional" primaries that are not nearly as bright.
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I don't think this light makes for an effective primary. I do use it as a backup though. Also on my trip to the Bahamas last week the light it put off had a purplish hue to it. I didn't like it for day use at all.
I'm very happy with my lights in Lake Travis. All three use the same XM-L T6 and all behaved the same way in the shallow blue waters of the Bahamas. I read an explanation that it's an optical illusion caused by the brain. That the light puts out white light and the brain filters it based on what it sees outside of the hot spot. Whatever the explanation, I know I found it ugly and not really useful. Just being honest.... otherwise I love all my lights.