Hello, I've had a smart car for 4 months, using it primarily to take my 5yr old to school and go grocery shopping, errands, stuff around town. I took it in to a local CHP to make sure I had the car seat installed correctly. Basically, he made me feel awful for getting a smart car and driving my son around in it. I decided to shake it off after reading the smart car website about safety and how others drive their kids in theirs. I did learn though, that his seat expires in 6 months so I'm in the market for another seat. It was recommended to keep him in the 5 point harness, not a booster, in this car because the booster would have him to low in the seat, and too close to the dash. We have a Britax Boulevard now. What do others have for their 5-6 year olds in their smart cars? Thanks, I'd appreciate your suggestion.