While I've had some sweats against Electrostatic Pummeler decks on MTGO, I've handily defeated all of my foes on Metallurgic Summonings. Even still, the SaffronOlive effect is causing a spike in the five mana enchantment.
While I do think there is merit to both Dynavolt Tower and Torrential Gearhulk in creature-light decks, I'm convinced that Metallurgic Summonings should only be played in small numbers, if at all. The Gearhulk decks are already quite capable of taking over games without having to play a five mana spell that does nothing the turn you cast it, and as such including the card in your deck strikes me as a significant liability.
At the current $8 price tag, I would be enticed to sell into the hype. It wouldn't be the worst move to dig for cheaper copies to try and move, though I firmly believe the card is currently over-hyped for Standard play. Metallurgic Summonings is not a card that I expect to have a stellar Pro Tour weekend.