The slingbow is a very popular weapon as it is compact, lightweight, easy to make and can shoot hunting arrows. But it competes with small bows, such as the "Liberty I" by Howard Winthers from www.libertyarchery.com.
This video presents the "Liberty I" bow and compares it to the "Diamond Razor Edge" compound bow and the homemade slingbow (see the How-To on The Slingshot Channel).
The results are quite impressive, the small Liberty I shoots a 400 gr arrow at more than 310 km/h. It outperforms the larger Razor Edge and of course also the slingbow (made with materials for under 10 dollars).
Slow Motion scenes recorded at 1200 frames per second show the behaviour of the bow when shot, it stays amazingly calm.