Bought myself a VibraCheck stablizer (7 1/2" ) over the past weekend...I had a choice of getting a Doinker 7" . I chose the VibraCheck because it is completely filled with gel...from end to end, while the Doinker is partially filled with gel. The Vibracheck is a bit heavier and bigger...it is also rubber coated. More expensive than the Doinker too.