It's great they're doing this. I've been nudging everyone involved with this since last year. The Chrome guys are the furthest behind (no support). FF has flag support.
I've been testing it since last year on FF and Safari and have no complaints about their implementations. I know some people are sniffling about the placement and naming of the properties. You have to be pragmatic about it, though, and realize there probably isn't a perfect solution and just implement it.
I refuse to use JavaScript for the fallback, so the fallback is a lot of ugly CSS that doesn't order things in the right way, but it doesn't make a big deal of trouble for the project I'm working on. Most people will fallback to JavaScript right now, though, and when JavaScript is your solution to layout then you're already on a loser.
I've been testing it since last year on FF and Safari and have no complaints about their implementations. I know some people are sniffling about the placement and naming of the properties. You have to be pragmatic about it, though, and realize there probably isn't a perfect solution and just implement it.
I refuse to use JavaScript for the fallback, so the fallback is a lot of ugly CSS that doesn't order things in the right way, but it doesn't make a big deal of trouble for the project I'm working on. Most people will fallback to JavaScript right now, though, and when JavaScript is your solution to layout then you're already on a loser.