I don't get it. You start a thread with the words, "not impressive" attached to a light model and then you ask a question that should of been asked by you prior your purchase.
How did the LD15 perform for you, how was the beam, what did you like or dislike about the UI, how's the texture..etc, etc. If you would post some definitive descriptions of your experience with the LD15 and then you were not impressed; that would be more supportive of the thread header. Your asking an OK question, but regardless of the answer, your negative header is not warranted in my opinion.
I'm thinking of buying this light and have an LD01 in my pocket as I write, so I am interested in information relating to the LD15. But when I read your header I said, "wow, may not be buying this one" and then I opened it and there is nothing of substance to support the negativity projected by your thread header.
Not coming down, just trying to make the forum a little better for everyone.