Whoa! Slow down a sec. No question, Merlin's firmware is better, but do you need anything better than the AsusWRT that came with the router? ... "If it ain't broke...."
Liked your post / liked your advice. When the router at work broke I stuck in my old home router (a WRT54GL) for a couple weeks until I could buy a new one. We have a couple dozen plus devices and it actually carried the load as well as the E2500 that got fried (after an area blackout).
On the downside it had the same problem as my older router; I was flying blind. Our ISP was having numerous intermittent outages and their only reply was, "It must be you, buy more bandwidth".
My N66U, out of the box, showed me it was not a traffic problem. Coupled with no traffic on my side and a nice
ping plotter chart that suggested it might be their border router, well they still said it was me but, curiously, we haven't had an outage since.
"Out of the box" also allowed me to identify and fix a couple problems I -prior to- wouldn't have a clue. For example the real time chart showed me that something was flooding our
outbound, pegged to the max, complete flat line. 24 hour chart showed me it had been going on for hours, since about 8:15AM.
How are we even running? Oh yeah, that QoS stuff must really work!
Another chart showed me it was coming from the 5Ghz side of wireless. The device chart showed I only had a few devices running at 5Ghz. I was already familiar with most of them (and I knew them to be
nine-o'clockers to boot).
That left an unidentified iPhone and one of my bosses (who starts early and who is an iOS fan). Turns out he had just bought a brand new iPhone. Had him stand in front of my traffic monitor, shut off his phone and the traffic stopped.
Few more anecdotes but the point is
out-of-the-box is pretty darn good. I've listed a few
wish-list features and, over time, I might try alternative firmware if its features are on my checklist but, for now ... I'm living the dream!