We have the Britax 123 and we think its fab! it's much cheaper than buying a maxi cosi and then a boster seat, it's really confortable, easy to fit, and my son sleeps well in it, although if your baby always falls alseep in the car you might want a maxi cosi, as you can recline then whilst driving. The big push for us towards the 123 is that our son is a big boy and tall, and would have grown out of the maxi cosi before he turned 3.