I'd echo nicm's comments. I have the KISS, which is also sold under the name Atko Graco Duologic II
It is so well thought through...
from newborn the seat part comes out, has it's own set of wheels on the bottom, and extendable handle like a suitcase, so you can pull it short distances. It also fits onto a graco pushchair, and it can be fitted on it's onw in the car, or on top of the iso fix base.
It will then keep your little one rearfacing until at least 3 or 4 (which is now accepted as 5 times safer than turning them forward facing at this age).
It can be belt fitted or isofix, so fits in pretty much any car, is very easy to fit....
....and best of all, is one of one 3 seats (the besafe ones being the others) to pass the extremely stringent swedish Plus safety test- so is a world leading in safety
I love mine I'm in Devon if anyone wants to test mine out in their car (I've also got a besafe belt fitted rearfacing seat too, if anyone wants to compare the two, before buying )