Factory Jackson did a brilliant long term review of Eagle the other day, well worth a read.
I’m 8 months into Eagle ownership. Aside from the lower bottom gear (and/or taller top gear) there’s lots of little improvements. I was sceptical, but the reality is it really is a lot better groupset than just the extra cog. Cassette looks almost new after 500 odd miles off road (including a lot through winter), chain is nowhere near 0.75% stretched (I was getting 300-350 miles on an 11spd chain before they went past 0.75%!), shift action is a little lighter and the clutch action in the mech is even better at keeping the chain on.
I upped from a 30T chainring to a 32T, which meant I had a slightly taller top gear that I can just about use on occasion, and a super low bailout bottom gear that gets reserved for the steepest of climbs. Tried a 34T briefly and found 34/10 unusable, and the 34/50 bottom gear was useful but not as useful as 32/50 and a 32/10 top gear I can actually pedal at times!
Put it this way… I’m in the middle of working out how much I could make for the 2 spare 11spd drivetrains I’ve got lying around, some forks I’m not using and spare set of wheels, to go towards an Eagle setup for my new Hardtail!