My loved ones and I are thinking of buying a current MX-5 as a second car. We have a three-month-old son and since the car is not only to be used as a fun, but also as a everyday vehicle, we wonder how easy it is to handle child seats. Does the MX-5 have Isofix? Are there any differences between the Kinenbi and Recaro seats? Are there differences between the Roadster and the RF?