Air Jacks

[ctc]

Any opinions on the usefulness or otherwise of Air Jacks? Also which brand and any UK suppliers?

To start the ball rolling... on the positive side I hear they are great when you do get stuck in the sand where perhaps other jacks would be less stable.

I also hear, some recommend them for righting a vehicle which has rolled but since I understand they have to be inflated from your exhaust I am doubtful as to whether your engine would run long enough to pump the jack up.

On the negative side I've heard that when deflating them the valve which releases air sometimes gets trapped by the folding fabric when deflating, necessitating you to get under the vehicle in some cases to sort it out. I would have thought that this could be avoided with care and attention though.

Thoughts?