Little Miss has been using her brother's old car seats. Fortunately they have worked well! Unfortunately she has used them past their expirations. If she only had a short time left in a car seat I likely wouldn't have invested in a new one. However, since she is still all of 27 lbs, I think it is well worth the investment! If she continues growing at the same rate she has over the past three years then she will be 11 before she outgrows the harness in this one! It will convert to a booster at an appropriate age/weight also.