The Double D simply doesn't work in my opinion. I understand the progressive evolution of logos but there simply isn't anything to justify it. The chain can be represented in much better graphic ways, but it's an already seen logo. See Chaincoin as just one example!
It's best you first of all read up on the whitepaper, and then perhaps have a go at our FAQ. DASH is the future, but you must first understand it before you partake of it!!