For sub-20lbs infants, the Graco system is fantastic. Being able to transport a sleeping child to/from the car in the basket seat and just snap it into the car or stroller is HUGELY important. More importantly, fastening an awake (and squirming) child into said basket seat is MASSIVELY easier when done out of the car, then just drop it into the base. Performing the same operation on a rear-facing fixed-mounted seat, especially in a car with limited rear headroom like a sedan is literally a pain in the neck (and several other areas). As a bonus here, the Graco stroller that we bought can be used with the cradle like a base, but also as a regular front-facing stroller, and was the ONLY stroller we found that folded flat enough to fit into the narrow trunk opening of my wife's BMW 3-series trunk.
For babies bigger than 20lbs or so, the basket/base starts to get impractical because its just awkward to carry that much weight at a weird angle. (Weight of the carrier is a factor here, totals up to 33+ lbs) This was about the time we switched our daughter to a "convertible" seat (still rear-facing), although her height (length) also dictated the switch, since her feet were sticking out past the end of the basket.
We have two different models of convertible seats in rear-facing mode (going front facing in a couple of weeks!! :wings
, a Recaro Como and an Evenflo Triumph Advance DLX.
I bought the Recaro from Woot for $99 and it was a killer investment. Its a fantastic rear-facing seat, but more importantly it can be used front-facing up to
80lbs, which means that even for those who pay closer to full price, you get a lot of use for your money. As has been mentioned earlier, the side-impact protection is substantial (and one way for manufacturers to differentiate with a "safer seat", since the current certification testing for car seats doesn't cover this criteria thoroughly). The one feature that is not strictly a negative, but that can be done better is the adjustment system. It uses the same over-the-shoulder-to-between-the-legs cam-lock system that the Graco infant seats use. This works fine, but if your kid is a wiggler like mine, you'll have to release a lot of slack then re-tighten that belt a lot to get him/her in and out of the seat. It's just a bit tricky to get to when rear-facing because the belt is smooshed up against the seat back.
The Envenflo Triumph, on the other hand, has a really nice tensioning system that my wife finds easier, especially in the tight confines of the back-end of her BMW. You tighten the harness by cranking a knob (on either side of the seat), and release tension by pushing a lever next to the knob. Also the shoulder attachment is self-adjusting for the child's height unlike the other systems which require you to relocate where the strap passes through the seatback periodically as the child grows. Side-impact wise it looks good, though perhaps not as robust as the Recaro. Its also a HEAVY seat, which only matters when you're wrestling it into the car. The one other problem I had was when I first fitted it to my wife's car I used the LATCH attachment belt, and got it very tight to keep the seat from moving (like you're supposed to). Unfortunately there was so much tension on the belt I had trouble getting the belt released when I needed to remove the seat, so I had to slice the provided LATCH belt and use the regular car-seatbelt to re-attach. This works fine, just not as simple as the LATCH system.