Motor Trend test of the 650R, below, from off of Hennessey's website. Apparently, it's fast!
C&D tested the Venom 600 and got
Zero to 60 mph: 3.4
Zero to 100 mph: 7.5
Zero to 130 mph: 12.0 sec
Zero to 150 mph: 16.1 sec
Zero to 170 mph: 26.2 sec
Street start, 5-60 mph: 4.2 sec
Standing 1/4-mile: 11.4 sec @ 127 mph
Braking, 70-0 mph: 157 ft
Roadholding, 300-ft-dia skidpad: 1.01 g
http://www.caranddriver.com/article....&page_number=1
(Wonder how the lawsuit went.)