My first trip with the BEST seat . Frankly I found the NEV4 to be more comfortable for an 11 hour trip.
The BEST seems to have very little padding, no more than economy, and the cubbyhole for your legs is kind of confining. Just could not get too comfortable like I could in the older seats.
I also don't understand controls. The one closest to the seatback raises it to seating position while the middle button to some level of horizontal. Not sure what the third button is supposed to do, since all it does is shift the seat back and forth when not fully horizontal. There is no way to control the back and leg portions of the seat separately.
Anyway want to see if anyone else shares my opinion, and could explain what that third button is supposed to do.