Sixt - car seats for children sixt

anyone have experience renting car seats preferably with sixt in italy

are the seat decent? worth cost?
Parents dont want to take them from US international flights with 3 -4 year olds

They'll do the job; they are also mandated, but I think you know that already. You can buy "better" seats in the US, but the seats they rent in Europe will work for you.