I recently part-exed a 2017 Fiesta (before it went 'boom') so in the spirit of the similar YC thread, here's my random 'bonding' thoughts after a fortnight with my new Yaris Excel...
Pros
Love the looks
Great MPG figures so far and yet it will still rocket past most things if necessary
Love the Excel seats (design, comfort)
Hybrid/auto driving (both a first for me) are absolutely superb
Nice handling, so far
The 3 pot ICE is waaay smoother than the Fiesta's Eco