The bike rides very smooth on gravel. A combination of big tires, the future shock, and a seatpost that can flex. I currently have the stock 38mm tires on there, and they measure a true 38mm on the 24mm rims.
There’s about 10-12mm of clearance on each side of the front and rear tires, so I’d bet I could fit 50mm tires on the bike (Specialized says 47mm clearance). And with 50mm tires on there you could tackle pretty much any gravel conditions.
The bike feels very stable going downhill - noticeably better than my Domane. The tires obviously help, but it’s also longer and slacker.
The future shock works in a way where you don’t notice it - other than the road feels smoother. Even out of the saddle, you don’t really notice the future shock in action - at least not under the conditions I was riding in my first ride - meaning a leisurely 50 mile ride. Maybe sprinting it’d be more noticeable.
On the road, the bike feels very road-like due to the Pathfinder tires - which have a slick center tread. At least under the same conditions as above - a leisurely ride. Hard cornering and accelerations on the 38mm tires would probably feel different. And I’m sure the rolling resistance is higher, but that’s hard to measure.
The slacker head angle feels very natural - meaning the bike neither feels twitchy or unresponsive. That’s probably because it’s in between the other bikes I ride (road, MTB).
This bike will probably tie with my MTB for ride time over the summer/fall - OK, maybe not quite that much, but it’s a sweet bike to ride on gravel.
Regarding power meters, I don’t really know, as I don’t have a power meter on any of my bikes, so I don’t know what clearance is needed. It’s got a threaded BB however, so that means a little more clearance between crank and frame/chain stay than my Domane.