I have 2 routers, a Netgear WNDR3300v1 and a Netgear WNR3500L. I ran DD-WRT on the WNDR3300 before we moved into our new house, and it ran okay. Had to reboot the router every once in a while. After we moved, I ran it for a few months, and as more and more houses were built, more and more wifi AP's started popping up, and I started having problems. I updated to the latest "stable" firmware recommended for my router, and things just got worse. Connections would drop on Wifi quite often, and pissed my wife off to no end.
I figured the router was dying, so I flashed up the WNR3500, and things were even worse. Finally a few weeks ago, I got sick of listening to my wife bitch, so I took the WNDR3300 and flashed it back to stock Netgear firmware. I haven't had a single problem since. Wifi is rock solid stable. The only thing I was really using at all out of DD-WRT was the Dynamic DNS updates and static leases. Both of those options happen to be available in stock firmware as well. About the only thing I miss about DD-WRT are the statistics and graphs. No big loss. My wife hasn't bitched about the internet in 3 weeks.
IMHO: At this point until there's an actual STABLE RELEASE of DD-WRT, it's not worth it.