UPDATE (11/7/15): Bing Pong 21 is live! You can find more information about this huge update here.
As a result, the bot is now much safer to use and --disable-web-security is no longer required!
Also, "Emulate human searching behavior" is enabled by default, so you will experience slower searching.
To get pre-Bing Pong 21 searching speeds, you may disable this option, but using it is strongly recommended.