I took 6 practice tests this past week before finally taking the actual test today. I scored (in order of taking):
GMATPrep (1): 730
GMATPrep (2): 740
Manhattan GMAT (1): 700
Manhattan GMAT (2): 700
Manhattan GMAT (3): 710
Manhattan GMAT (4): 700
Actual Test: 740
In all tests, I was pretty consistent: verbal was slightly better than math (in percentile). I just wanted to let you guys know to help calibrate your practice test scores.
Cheers.