As others have said, my E-Torque is absolutely seamless, only noticeable when paying attention (since many other factors like frame "anti-vibration" shaker weights already smooth out the engine). Technically, if I completely let of the brake, the truck bumps forward slightly more when e-torque starting than it would with engine idle, but the difference is negligible. If I immediately stomp the pedal from there, the truck engine picks right up from the momentum of the e-torque and the acceleration from dead stop of start/stop enabled and disabled is identical for me.
On the other hand, since I don't have a non e-torque to compare it to, I can't tell if any of the other claims are accurate. Shifts in both directions are smooth as butter, but every review I read tells me that is a factor of the transmission alone and not from the e-torque helping it. Brakes feel just like normal, so I can't tell if it is using e-torque or regular brakes (even when using them very lightly). I will have a better idea in a couple of years on if it is increasing the life of the brakes, and it will be a decade before I know if it helps the transmission since the ZF tranny is already near bulletproof if treated appropriately.
As far as economy goes, I drive around 90% city, though my city driving is represented more by mostly 5-20 MPH stop and go traffic with stop lights sprinkled between, so perhaps isn't what the intended use case becomes. However, with those conditions, I am getting between 14-15 MPG, which is what I expect for a non e-torque. Again, without having both types available to test, maybe my expectations are unreasonable. I am curious if my mileage will increase over time as the engine breaks in (has less than 3k miles right now) and after I have the latest transmission TSB pushed to my truck.
If you can wait a little longer, I would wait a few months to hear from the Detroit Auto Show to see what the 2020's have to offer, to allow inventory liquidation sales on the 2019's, and to get more long-term feedback on the e-torques from the community (they only shipped to customers and dealers around August if I remember correctly, which isn't enough time to work out all the bugs).