An excerpt from this month's Consumer Reports:
[color=dark red]The attachment broke on the Combi Avatar convertible seat, sending it flying off the test rig, at a crash speed lower than that which the government requires car seats to withstand. We rate the Combi Avatar as Not Acceptable, and urge the manufacturer to fix the problem.
The Evenflo PortAbout 5 infant seat flew off its base at a crash speed just above the federal standard, a margin of safety that is too small, in our judgment. We have rated it poor for crash protection.
Two other seats had problems that were less serious. The Britax Marathon convertible seat and the Combi Tyro infant seat tilted back on impact more than the federal standard allows. But those car seats didn’t break loose in our tests.[/color]
I can send the full article to anyone interested and too cheap to buy off the news stand - it's too long to post and the link won't work as you need a paid subscription.
ETA: this is allegedly a free article so try this link:
http://www.consumerreports.org/main/...=1114798942242