They are also pretty innovative when it comes to finding new ways to kill innocents. Hamas and Hezbollah have copied some of their tactics.
From the multiple "suicide" bomber approach, which has culminated in some of the most devastating attacks-in terms of sheer damage to military equipment-to the easily retrievable cyanide caplets that their leader developed as a handy method for avoiding detention and interrogation, these people have pioneered massive urban terrorism.
I think that Hezbollah, Al Qaeda, and perhaps, the FARC, are the only bases for comparison.