Would you buy a convertible car seat for an infant to use and grow into?

We only used the infant seat with the removable base for maybe two months before we bought a convertible. They do look awfully tiny in those big car seats but I love it so much more than the infant seats! My son is 8 months old now and in the same car seat (we bought an evenflo convertible car seat). The only drawback I found to the convertible car seat was that if he fell asleep on the ride when he was an infant, he usually woke up getting unbuckled and pulled out of the car, whereas in an infant car seat you can just take it with you and they still get a good nap. I would say if you have an infant car seat from your older child(ren), you might want to use it for awhile, but the convertible car seats are definitely worth the buy for a couple months later!