We've got the Britax Boulevard, and we really like it. It's nice and comfy for Ben. We used it rear facing and now forward facing. It's got a lot of safety features like extra padding. Ben is very comfortable in it.
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We also have the Boulevard and like it a lot. It has a lot of extra cushion and our boys are very comfortable in them. Plus the ones we bought had the Click Safe feature where you pull the strap and it clicks when it's secure enough. They weren't cheap but we figure they'll be in them for years and we want them to be comfortable and safe.
Re: Which Britax and why?