I've used this site about 6 times and have never experienced any problems. My itunes vouchers always work with no hassles at all. I definitely recommend it.
I have never had a problem with this site. It makes sense to always have a good solid firewall up to date if you intend to purchase anything online, but I do not believe that there is a problem with Evopoints.
Shortly after making an online purchase with my credit card on Evo Points, fraudulent transactions started going through on my credit card. I don't use this card at all for other purchases, so I don't believe this site is a safe place to make online transactions.