I just picked up a parcel from customs... the guys at http://www.shoottech.com/ sent me a prototype of their upcoming "Raptor" compound slingshot.
Wow... just wow!
This is a well designed, perfectly machined cutting edge compound bow.... but it uses rubber as energy storage media, and it shoots steel balls (held by a rare earth magnet) as well as arrows!
This is brutally fast (haven't clocked it yet), and totally accurate (thanks to the professional 3D sights).
I believe this weapon takes slingshots to a new level. Can't wait for the weekend, for further tests!