Remember that something that sounds too good to be true, usually is.
There have been instances where pre-paid cards and vouchers have been sold by criminals engaged in black mailing and other criminal activities, and once you touch that card or voucher, your ip is logged, and if the case is big enough - you will have police at your door, and they confiscate equipment without asking you. This has happened. So stay safe, stay away. And if you chose to interact, do it with an ip that's not your own - and hide your tracks.
After some research it might seem like bestxchanger is legit, but be careful. Who gives money away online for free?
man you should see a doctor for paranoia There have been instances where pre-paid cards and vouchers have been sold by criminals engaged in black mailing and other criminal activities, and once you touch that card or voucher, your ip is logged, and if the case is big enough - you will have police at your door, and they confiscate equipment without asking you. This has happened. So stay safe, stay away. And if you chose to interact, do it with an ip that's not your own - and hide your tracks.
After some research it might seem like bestxchanger is legit, but be careful. Who gives money away online for free?
i suppose that not more than 2% of my client are involved in bad stuff and usually its shit like carding .i cant cashout nok voucher you want me to put it in a trash can?why man ?tell me just why i cant have a conversation with someone on bitcoin without the word "fraud" "crime" appear in the first sentence?im depressed bro .. 
not really but im supposed to beThere has been individuals having police at their door confiscating all electronic equipment because they've bought ukash vouchers from an unknown source.
The reason the police have done this is because that spender of the ukash is the source the police has. If the recepient has done nothing wrong, they will eventually be cleared, but to great personall distress.
Anyone being naive in the world of bitcoin will sooner or later be the victim of scam/fraud. Always do due dilligence, and it's better to stay safe than to walk into problems.
It's understandable this may be frustrating for any business in the bitcoin ecosystem, but the only thing you can do is to do legit business, and build up a reputation over time.
It's not paranoid to proceed with caution, and esp. when there's something that sounds too good to be true.