I can say I see a large difference between UA mid and upper level.

1Ks get free Upgrades on Shuttle flights, wavier of alot of fees.... calls on delays, protection of seats, "operational" and "complimentary" upgrades during certain situations, etc.

I really do like UA's network.. ifyou fly to many locations, there are extensive non-stops. Non-stops are wonderful... as much as we like segments.. I sometimes need to get someone early.. and United works wonders for me from southern california...