Have stayed here 5x. Can not say enough good things about this resort. It's everything a Disney Deluxe Resort should be at nearly the same price point. Yes, you don't get the amazing theming like you do at Disney, but you get world-class service, modern technology, restaurants that prioritize their own resort guests, up-to-date room decor, great private bathrooms with separate shower/tubs, and a pool that will blow your mind. You have to remember, Disney invited Four Seasons to be on property because they realized their once-amazing resorts had done an subpar job at keeping up with the times and were losing tons of high-value guests to the Waldorf and the Ritz Carlton, where there was no prioritization for Disney (i.e. Universal is a valid option to spend a few days). At the FS, they even have Disney Cast Members staffing a "Disney" desk for anything you might need theme park related.
As others have said, the pool complex is incredible. Kids can enjoy the lazy river, slides and tons of other stuff. Literally a small water park in and of itself. For some adults only time, there's also a great infinity pool where kids aren't allowed.
Food is on another level. No Disney Dining Plan to dumb down menus. The pool bar/restaurant is fantastic and is not your typical pool food. The freshly baked pretzels with beer cheese are to die for. Definitely do Capa for dinner. It's great. Best steak on property, I think, with an Argentinean flair. I've heard great things about Ravello for dinner, but I haven't tried it.
As far as rooms, they're modern, up-to-date and filled with the latest technology. Unless you're packing a telescope, my one tip would be don't splurge on a "Disney" view. It's just not close enough, honestly, be worthwhile. Lots of trees and a faint glimmer of the Castle a few miles away. The fireworks are really the best part of that view but you can head up to Capa for the same effect and save a couple hundred bucks a night.
The breakfast restaurant is great and Disney characters are available twice/week.