I'm surprised at how much I like that Sentinel, although it's not THAT much. Never minded the Tarn mold, and they did a lot of new things with it. Not a fan of this altmode though, and he needs to be beefier and more beweaponed. Content to keep using the TR one, which has kind of stuck in my mind as his "look" anyway.
The Conduit makes sense, although in my head I figured it'd be a rack of sorts too. Maybe a multijointed one that could be reconfigured into a halo, which could then mount on a a papercraft something like the Throne. As it is, this "Sentinel Artifact pack" is really just Sentinel with a holey accessory.
I'm halfway intrigued by the 3-pack, mostly to get Bluestreak with opaque plastic and a non-busted up Ironhide (the dying version is a good stand-in because the face passes as just angry, but there's no un-blasted-upping that altmode). Mirage I can take or leave, as the Kingdom one is fine (I repainted the toy-style head on the holo and put it on that, and found a 3P toon-style holo head for Holo Mirage). I'd love for them to keep redoing these without clear plastic, especially as they rely on it so damn much.