The EC 120 is a great machine whilst your children are small and the luggage compartment is massive. If your children are 90kg it is another story, as you will run out of fwd balance. You don't have the reserves of power of a 350 but you don't have the fuel consumption either and maintenance is relatively beign 9cost wise) due to the modern design. More comfortable passenger experience than a 206 (any mark) in my opinion. Very much more confortable than the 500.
Best advice is to look around for machines you can go an actually sit in / take a look around. Some owners will share maintenance history with you also.
If you are anywhere near London Gatwick then PM me if you want to look around / chat. (No, I am not selling my machines).