No, it is also a potential issue if you do a lot of data transfer between networked devices on the LAN in question. It could affect network performance if you backup your computers to a central server/NAS, for example.
Not dd-wrt related, but this past week I had a real-world experience backing up 30+ GB of data from an old 100Mbps-only laptop and then restoring to a new Gigabit-capable laptop. 100Mbps was comparatively slow.
when you're doing a serious backup, you leave it on the desk and move on with life.
that said, I went ahead and just purchased one of these.
For those interested, I no longer plug my phone in to sync files with computer. I use FolderSync (android app) and Filezilla FTP Server (free) on desktop to mirror the folders I care about on my phone to the Box folder on my PC that syncs to cloud (in case harddrive crash...).
Over wireless on 11n, from my room, this runs about 1MBps.
Over wireless on 11n, from the hallway above the router, runs about 3MBps.
The majority of delay in this setup comes from the 1MBps on larger files and from FolderSync serializing the syncing. So, for lots of small files like pictures, each file takes at least 3-7 seconds, when it should only take 1. As a part of the serialization it walks the folders while is syncs each folder, as opposed to walking all of them and asynchronously queuing and syncing the files, which would be ideal.
So adding AC will help on both fronts, but mostly with the larger files like video. Having the untapped speed will also serve as motivation for me to submit a patch to UltimateSync, or write my own sync program to perform transfer queuing to reduce the FTP transfer setup and destruction delays.
My point: it's a significant quality of life improvement to have both wireless syncing and wireless charging, and in a year when everyone is on AC I expect the biggest reasons not to will be managed, and I would recommend others who don't, to look into doing so, as well.