Update 2017-05-06: There is now a one-year follow up to these initial impression.
A couple additions from things I forgot and feedback I received:
- A friend who also tried the Rumble VR says that they did not work out for him because of the foot bed: "I owned a pair for a week. They killed my arches. It's possible that I just have really high arches, but I've never had a cycling shoe mess with me this way..." Giro offers adjustable inserts to vary the arch support, but they are rather expensive.
- I forgot to mention that because of the snug fit and the lack of a loop at the rear, I use a shoehorn to put them on. Without that, you'd have to loosen the lacing quite a bit to comfortably get into the shoe and/or possibly destroy the heel cup prematurely.