Premier for a year
I'm a Premier this year, but won't be again anytime soon. So far, probably all my UA travel will be via FF miles this year. The 2 trips so far worked out well with E+ and so forth, and empty middle seats, and this fall I will benefit from being a companion to the person booking the FF flight (E+ there as well for both of us). But advance boarding....minimal value to me and I tend to get aisle seats where early boarding is of little help.
I am paying for several AS flights, as well as one AA flight....these will generate extra miles on AS due to comped upgrade status based on UA Premier. That's nice also. I even sampled the Boardroom AS has in Seattle...nice but not essential.
But I can live without it, as a non-frequent flyer!