A recent experience on a Tuesday morning flight (8 a.m.) had shown U0 all week leading up to departure. I was resigned to my fate being a Y seat, but lo and behold a boarding card to sit up front was given to me on checkin. Breakfast was a hot frittata (I still really do not know what that is). The flight was full BTW.
Almost as important as the chance to sit up front was the fact that the MVPG got me in the fast track line for security at SEA which surely saved me an hour at that time of day.