The only drowback is the seasonal failures. I used Adwords cloaking. The life of my accounts is short, they are banned, but during this time I've managed to pour traffic, find clients, from which I receive rebills now. Statistics on the Adwords cloaking for two months, it's was a long-lasting account. As they say in support, the spring season will soon begin, so I'm preparing accounts, this time I will try to pour traffic longer.