Joined on 11-19-2006
In NYC for now, but always a Jersey girl at heart!
The combi is a good seat and well liked by techs. The only problem with it is that it has a very short shell (even shorter than britax seats) meaning that it will be outgrown much earlier than other seats on the market and may not get your child rear facing to 2 (britax seats don't get my kids RF to nearly 2 nor harnessed to 3 and the combi has a shorter shell than that).
I was able to get two rear facing radians installed in my beetle for a while before the angle adjuster was introduced, so if you got a radian with an angle adjuster you would likely be able to fit it in most cars. It has a tall shell and high rear facing height and weigh capabilities. It's also fairly low profile, which is nice.
Not sure of what others are great in small cars, but hope this helps a little.