A negative - over time, I think the straps may shrink a little; and the metal cord may come out of the fabric. Nevertheless, I am now about to buy another pair...
1. Secure your boat while on the racks (don't forget to lock your racks)
2. Tie your boat down if you tie lame knots like I do!!!
3. Make tie downs at the end of a long paddle or in cold weather very quick and painless!!
I know of at least one kayak retailer planning on selling these in the Northeast, so you don't have to order from Australia! However, that being said, mine did cost me only $10 shipping and arrived in 8 business days.