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Hi-Metal R is pretty much what you'd get if Tamashii just straight up did Macross mecha as part of Robot Damashii, and still let them transform. They're exactly in that normal Damashii size range and only have a bit of metal in them, mostly in the feet and joints. Its reinforced with diecast so it doesn't just crack in half when you're transforming it.
I'm sure a lot of people remember or have seen the Revoltech Valks that transformed from back in the day and how janky they were/are. The Hi-Metal R stuff is amazingly solid. Everything pegs into place. They also add a ton of accessories.
On my Hikaru VF-1S Strike Valkyrie it came with a bunch of hands in both the puffy anime style and a more modern mechanical one. All the missiles and missile pods are fully painted and detailed. Three sets of wings (clean, hardpoint, shrunk for battroid). All the strike parts some of which are interchangeable if you just want boosters instead of the beam cannon. 3 different antenna's. Landing gear. Vent covers. Its pretty amazing. They're pretty much just deluxe Macross Robot Damashii.
Here's a picture of the engine detail I was talking about.
