First flight on an A220-100 currently - I'd say most of the comments/reviews are spot on.

Definitely some nice tech on the plane - large seatback screens, cool airshow/flight tracker. Roomy lav in F, can actually turn around in it without hitting my head or the wall and able to wash both hands at the same time in the sink - puts the 739 lav to shame. FAs seem to enjoy working the plane also - the flight leader normally is a purser on A330 tatl routes so she said it felt like a barbi version but was very functional.

Agree the seatback pocket is a mess - the material is only held by velcro at the bottom and its all loose or hanging and lets most things you put in slide through to the floor. The 'upper' pocket for the safety card is useless other than squeezing in a phone or napkins. First row of F has almost no legroom - avoid. Seat recline is generous in F but too much to the point that seat can end up in your lap. Fortunately most pax are only reclining half way. If you want 'guilt-free' full recline, take the last row 3 since its C+ behind and there is extra space so you won't be reclining in their lap. Tray table soft open/close is nice. Tablet storage is a good idea in concept but as others mentioned is just a trash/crumb collector. Nice that the AC power is in front so easier to get to.
I Really like the cupholders too.