SeaSucker / Woods Power Grip - anyone have experience?

As the title states,

I'd love to hear some experience or feedback from those who have used the SeaSucker or Woods Power Grip.

Got a project I'd like to work on, don't want to drill and found these...just hesitant driving down the road at 85mph relying on these to do what they are "supposed" to do.

Thanks!

 

I used a single sea sucker to hold a chum churn off the side of the boat while fishing. That thing didn't budge while cranking away at the churn. Highly recommended, not sure about the other brand mentioned though.

 

Ive used my SS bike rack on a Corvette and Mustang with no issues, but kept it under 70 mph on the highway. Stop and check it every few hours.

 

I have the seasucker bike racks for about 7-8 years now. They work great. Never had a problem with them.