https://d1b10bmlvqabco.cloudfront.net/attach/is23h8nx8ff3jw/...
Short, blunt, helpful, clear. Pretty much what you'd like every memo you've ever gotten to be. Me, I'm a huge fan of ransom notes and Nigerian scam emails. We can learn a lot from them.
I'm pretty sure that when you get one of these that you're dealing with a script. You pay .65880 BTC into its wallet, period. There is no negotiation with a script. What I've also heard is that you can trust the script because these guys want a good reputation. If it gets out that you paid and you didn't get unlocked then no one would pay.
If you don't want to pay on the backend then you have to back up on the front end. You should do that already. You should be able to take a sledge hammer to your laptop, buy another and not miss a beat. If you could do that then you could just reformat and reinstall.
Prevention is worth it. Protection is worth it. Paying? Well if you did the first two you wouldn't be asking that question. But .65880 Bitcoin equals about 463.97 USD. So you might want to get on the prevention+protection train.
Prevention will help you against viruses, keyloggers, etc that can cause a lot more economic harm.
Protection, backing up, will also help you in the case of theft or dropping your MPB out of its sleeve when you get out the car. Done both.