Finally awaiting my RT-N66U

Been a looooong time comin', but I finally ordered myself a new router to replace the venerable 54GL.

Now, a question; should I upgrade to the latest official firmware, one of the Tomato builds (thinking Toastman), or just the latest Asuswrt-Merlin?

I do like the additional features, mixed in from both DD-WRT and Tomato, so there's that. Plus the Entware, on a ridiculously more capable router sounds like a great addition.

Any caveats I should be aware of?