I don't like that style on TDA, i prefer to have the second pylon somewhere else (Either to hide buildings/tech whatever) instead of being forced to build a second pylon at that same spot. Not just because of the fact that IMO a pylon free wall is safer but also if the zerg see the second pylon at your ramp they can easily sac a ling to get vision of any tech behind it and it keeps them more worried if they can't find any tech. "Is he going stargate, double stargate, robo, blink" etc and they would probably throw down a spore at each base, sac another ovie and every little bit helps.
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