Just to clarify - no reputable safety comparisons are done. Period. That is true in both Canada and the US. Transport Canada and NHTSA both have a pass or fail standard for seats. Anyone else is trying to sell you something. Having searched around at ICBC, all I can find are ease of use ratings. While an easy to use seat CAN increase safety, it is by no means the only important thing. The safest seat is one that fits your child, fits your car, fits your budget and will be correctly used EVERY time your child rides in the car.
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For those who don't see sigs, or don't know what the letters mean, I am a Children's Restraint System Technician. I am certified through St. John's Ambulance to know what I am talking about.
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Britax is a fine company, about the same as all the other companies and charges twice the price. There is nothing wrong with Cosco seats. Graco as a company has been doing really well lately, so I'm not sure why people would feel disillusioned with them.
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Car seats do expire, usually it's 6 years from the date of manufacture printed on the seat. For Peg Perego infant seats it's 5 years. Some convertibles (like the True Fit and the Radian) it's 7-8 years. For other seat it varies by component. Read your manual and it will tell you.
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ETA: And Britax's infant seat is a great thing if you have a huge car/minivan. The base is so large it is incompatible with many, many cars as 80% of the base must be on the seat of the vehicle.