I bought the AEM system because I previously had one installed in my Scion and ran it without maintenance or problems for over 80,000 miles. This product is all high-quality metal, no plastic, and should last forever. Not enough experience yet to rate performance, though I suspect my fuel economy is a bit better. The installation process was straightforward though difficult because the installation tolerances were so tight, requiring several loosen-retighten exercises to make it fit. All in all not an easy install, but certainly doable and requiring only some extra muscle and creativity. End result good looking and very stable.
I love this intake but I just wish the heat shield covered the filter a little better.