This car seat is build like a tank, which makes it quite heavy, but also very sturdy and reassuring. Its has integrated metal parts and very sturdy LATCH connectors, which are also much easier to attach/detach than those of the Graco SnugRide.
The seat has sturdy posts for the seat belt as well as a pouch on the back for convenience of storing the unused portion of the Versa-Tether (a.k.a. webbing) the attaches the back of the seat to the car in rear-facing position and reduces impact forces.
The height of the headrest adjusts using a rotary knob, which is convenient. The only issue I see is that the manual is permanently attached to the seat with a rather thick cord, so even though it is impossible to loose it, it is very difficult to read it even before the seat is installed, let alone after.
The use of the seat required reading the manual since I didn't know how to install it in the car, adjust it and its straps.
The seat supports both the seat belt and the LATCH installation. I installed it using the LATCH in our 2007 Honda Accord, first in the center position, the moved it to the position behind the driver, since it impaired backward visibility for the driver somewhat while being in the middle. It was installed in rear-facing position with webbing attached as well. Later, I moved it back to the middle rear position, front-facing.
Transferring this seat from car to car would not be very difficult, but I have another car seat in my 2004 Infiniti G35 (Japanese Aprica Marshmallow Bed model).
The buckle requires a lot of force to latch but I don't have to worry that I don't pinch my child while latching because there is a pad under it.
The seat is obviously supposed to be safe. Britax conducts crash tests of their seats and is considered one of the safest brands.
Although the seat is not cheap, it should last a long time since it is convertible (front/rear-facing). In fact, we rotated it to face forward once our son was 24 lbs since he was becoming too tall for rear-facing installation, plus he wanted to see where we were going.
It is important to note that when he was 23 lbs, he still could fit in this Britax inrear-facing position, whereas my other seat (Aprica Marshmallow Bed) required to be rotated to front-facing position at 22 lbs (which is less safe). And this Britax theoretically should let you use it up to 40 lbs in rear-facing position, but it depends if your child isn't too tall for it.
Pros: Sturdy, safe, good connectors, not very expensive.
This Britax Boulevard 70 CS is a sturdy and safe seat with convenient connectors and attractive design. I am glad I bought it and highly recommend it.