We actually have both seats, the Meridian in=s the main seat and in the back centre of my car, I have a BMW 118i, which has a very small back seat, I have put it on the side as well, when we have needed two seats int he car, and the seat has to go quite a bit further forawrd for it to fit.

The Compaq deluxe is smaller, but no where near as comfy, I like the additional padding and support of the Meridian.

I know that my Meridian is reverseable to 12kg, but the CD is only until 9kg, but i think the newer version does go to 12 kg. We are keeping DD in reservse as long as possible, but we have had to turn the CD, but then again she is only in it once a week or so.

I think they are a lot safer in the centre, so even with a smaller car you have more room IYKWIM.

I would also take you car to a store and see if then can pop each on in so you can try.

HTH