Remember that certain computers have valuable files, and that files can cost more than 1.5 BTC, probably OP is in that situation.
I heard reports that some people pays and is successful, but I believe it's a risk anyway.
As far as I know, they even give good support after paying. It's their core business to make sure everybody knows paying gets you back your files, if they don't deliver, their business model fails.
I've even read about competing cyber criminals, it's big business!
Just a friendly reminder to everybody: make sure you have backups, and make sure your backups are not just on a disk that is connected to the computer.
Are these ransomware makes caught in the past. If so, they might contribute a lot of money to the governments due to the seizure.