Actually, no, using stock Linksys firmware currently. I have them wired as I said, so no need for WDS or anything like that. Linksys firmware handles wired access points just fine.
I have used DD-WRT off and on, but the bottom line with that is, wideband at 5ghz just isn't quite perfect yet. It's getting close, but once they nail that, I'll be using DD-WRT permanently.