Since a few others followed in your footsteps here, it should be noted that Comex even mentions on the site that he simultaneously released a patch for the flaw he's using. As it says on the website:

"Along with the jailbreak, I am releasing a patch for the main vulnerability which anyone especially security conscious can install to render themselves immune; due to the nature of iOS, this patch can only be installed on a jailbroken device. Until Apple releases an update, jailbreaking will ironically be the best way to remain secure."

The Jailbreak community has been very open about possible security holes created by Jailbreaking, and the core Jailbreaking sites all have guides on securing your iDevice. Between that and backing SHSH Blobs, you basically can jailbreak ad arbitrium and not have to worry.