I’ve been using  DD-WRT and Tomato firmware on ASUS routers for some years now. Today, I installed the RT-AC3200 and, in the end, it couldn’t have been easier—comparatively speaking. You can find a lot of posts about installing Tomato on ASUS routers because it’s not simple. You can’t simply download an executable and click on it. But this was certainly easier that I’ve ever found it to be.