These are quite good. The hook buckle is easy to engage, and unlike plastic buckles, is unlikely to break. Adjusting the straps is equally simple, and it's possible to put a lot of force into them to really cinch them down. They release easily when you want them to, even when wet, but hold tight otherwise. I've started using them to replace strap systems on other things.
Don't let Mark's "weighty" opinion keep you from these straps. The guy hasn't even touched them! I agree that the weight should be provided by the manufacturer, so I'll give Mark's review two stars.