BEST seats afford me much better sleep (good solid 7 hours last night) than NEV4 which makes it a winner. I must say, though, that 14plus hours sat on BEST has left me with a slight backache that NEV4 never gave me. Might be my age if course
Getting a comfortable seating position with BEST takes trial and error as well but, as Goldorak says all the other ambient conditions make it a winner overall.