Let's put it this way ( Beautiful engine ), I love DH on the A220 because the engine sounds "cool" on take off when they spool up ( A320 sounds like a whiney sewing machine/washing machine, and loud ) but I hate the sight of those planes anywhere near me on the ramp when its time for pushback.
It would drive me nuts flying anything that takes that long to start the engines. Ramp controllers hate it.
Since I don’t fly on Delta I won’t be on an A220 flight, but I’ve been wanting to see inside of these aircraft.