I went with the Quarter Pounder patty and potato bun for $4.99, which seems a bit pricier than normal for their Signature Crafted line, which is typically about $4.50 for burgers without bacon.
The new sauce offered the sweet and tangy notes of Big Mac sauce with the heat of Sriracha. As far as McDonald's goes, it might be the spiciest sauce available on the current menu but the heat faded fairly quickly. The nondescript, melted cheese delivered a vague creaminess but didn't do to much to curb the heat. They both went well with the meatiness of the moist, grilled beef patty.
The crispy onions were just a little crispy, which was still welcomed. They contributed a nice caramelized and sufficiently onion-y note.