Here is my Checkpoint.
My idea is to use a bike from Sundays coffee rides on tarmac to gravel trips around my place. Hence I chose SL6 with 2x11 drivetrain which seemed to be a perfect fit for me.
First surprise was a size. I always ride 56 cm but bike fitting session before a purchase shows that - due to Trek's seatmast and my relatively long legs - I need 58. Second surprise was a frame. It is really massive. A trust is intensified by a rubber protector near a bottom bracket.
After first season I decided to switch a drivetrain to 1x11. I noticed that 2x11 is useless. According to a gear calculator 42 in a front and 11-40 in a rear should be enough to keep a pace on tarmac. But the main benefit of 1x11 is a smooth gravel ride when I do not need to think which chainring in a front is a right one. I really like it.
Next change was a handlebar and stem. Carbon set is extremely stiff! I wonder if it is not too stiff.
Wheelset. A stock one was replaced by DT Swiss XMC 1200 carbon set. 30mm internal width seems to be a perfect fit for 38mm Compass Barlow Pass tyres.
Weight: 8.64 kg (in a current spec, size 58 with 2 bottle cages Bontrager RT, XTR pedals, tire mousse and Garmin pad).
It could be reduced by ~100g by other saddle (here is a stock one - Montrose Comp).
This is my first gravel bike hence I do not have comparison to others. It is difficult to say if a rear Iso Speed works well and if a front one is really missing. I could say that tyres' pressure is a key. If I ride a gravel - 2 PSI works fine. If I ride on a tarmac - 4 PSI seems to be perfect.
Personally I think that the most advanced gravel bike will be Spec Diverge 2020 with the Future Shock 2.0. On the other hand there are some very good bikes w/o any suspension like Open, 3T, Merida and even Carbonda. Therefore in my opinion if you want to have top tech bike - wait for Diverge 2020. If you just want a gravel bike - choose a one and enjoy!