Latency based Alias DNS record in Route53

Yes, I know I write a lot about AWS these days, but you know, obsession is my thing. So as I wrote earlier, I generate my CloudFormation templates using troposphere, and the one thing I had to finish today was to register a latency based Alias record on Route53 for an ELB. While Route53 GUI is fairly easy to use, I've been stuck on its programmatic emanation for quite a while, so here's a troposphere definition of such a CloudFormation object: