So, after 300 miles I can report that:
I love the engine and the gearbox - quiet and smooth. On a trip from Dorset to London, Kensington and back, it averaged 58 mpg - not bad at all for a brand new engine. It had enough power to easily maintain 70 mph in 2-cyl mode. The ride is soft and decently stable.
The car as a whole seems well designed and not so well made. There's some wind whistling at speed and certain crosswinds, which wasn't there on the test drive car. There's a panel under the dashboard fitted improperly and something loose in the boot rattling, which I couldn't find and will be taking the car back to the dealers to figure. Nothing like this on the test drive either.
The infotainment and the driving assistance features feel like "work in progress" - some features of the Bolero are just not there and the button for changing the "speed limit/cruise control" mode brings the driving assistance menu instead. The default is with lane assist and cruise control on, which I find useless and even dangerous in town driving.
At least the Android Auto works as expected. The music sound is good. No SD slot and USB-A but two USB-C ports so I had to buy new memory stick and phone cable.
The car is SE trim, made in Oct 2020.
I'm comparing it to the Fobia SE 75 MPI, which I had before, and my wife's Peugeot 308 Active 1.6 HDi.