Hey Think. Five years ago, after exhaustive research (something I know you're familiar with), I ordered this product and installed it on all our gutters. I've been very happy with it. It does a great job shedding all the leaves and pine needles and it captures the water in all but the heaviest downpours. Plus, I found it easy to install with basic tools and it's been wearing well. You'll need a good pair of tin snips and be sure to get stainless screws.
http://www.flexxpointdirect.com/order-flexxpoint.html