I put a set on one of my cars two years ago, and I love them. They haven't failed me yet, but like I said its only been two years. As a matter of fact I think I'll order a another set. You will need to grind away a little of the battery hold down if you still have the plastic original, but it only takes a minute with a die grinder.
They are a little pricey for any more than they are, but there so much more handy than a hood prop.