Those that have the Vital Sign say it is an under-rated ball and that it's performance is really great. In Buddies ball review demonstrations, one video shows and compares 8 balls and in this video, the Vital Sign and Mission have identical looks so close that it is hard to tell the difference.
To find this video, you will have to click on the Curve ball....then go to the second video where they compare the lines of 8 balls, then go to approx the 2:50 time and you will see first the Mission and then the Vital sign and you will see they are almost identical.
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"Whenever I feel the urge to exercise I lie down until the feeling passes away."
Brick