I have been using the QAD Ultra Rest for about 3 years now. Really like the rest and the full containment aspect. You can turn your bow unside down and the arrow will not come out.
Another vote for the QAD Ultra rest here. It's full containment, can be ****ed up when you load it, and will only drop upon firing-not letdown. It's also very reasonably priced too.
The QAD Ultra Rest Hunter version is the most reasonable priced. I beleive it was around $45-$55, The premium models are over $100, but the hunter model works great.