What's even better than that is a coaster that has a strong mix of both positive and negative. Check out Shockwave at SFOT in the back seats to see what I mean. It gives the sensation that you will be hurled across the park when you drop from the turns after the loops. [:)]
http://schwarzkopf.coaster.net/ESshockwaveGF.htm
5.9 Gs in the double loops, yet I still black out more often on Batman: the ride between the first loop and barrel roll. [:P]