The seller's description is a bit misleading, saying that you'll be "replacing your standard LCD screen for this Touch Screen version." It's actually just a digitizer that you slap on top of your existing LCD.
And Quinten, you might want to change the title of your post, since the seller ships worldwide. So, it's actually available everywhere.
In JKKMobile's video, he says that the effect on battery life was negligible, only drawing ~100mV. His warning for novices was funny: "Be careful, because you might break the whole device, and you really don't want to do that."