Just tried the CB4.3's and Vapor 9's in my local store. The Cb's are definitely lighter, not remarkably lighter, but it is noticeable. They also don't have that horrid constricting feeling that the 3.3's had for me (especially the Spring 2011 one's).
The vapors were pretty junky. Felt like a glorified running shoe. Looks like trash, feels like trash. Keep in mind that i've never been a fan of vapor's...