I have a Buffalo WZR-HP-G300NH and a Netgear WNDR3700, both of which are running DD-WRT.
Currently the Netgear pretty much functions only as a wireless access point, but neither of them are ever reset unless the power goes out. The longest time I've had between power outages is about 4 months, so they're decently stable.
I'm also running two desktops, 4 laptops, an xbox 360, a ps3, 5 android phones/tablets, 1 ipad, and an iphone on it. At times these may all be on simultaneously. When transferring files between the two desktops connected via gigabit ethernet, I get speeds greater than 70 MB/s.
Desktop: i5 3750k @4.2 GHz | CM Hyper 212+ Evo | Gigabyte Z77X-U3DH | Gigabyte GTX670 Windforce | 16GB Samsung DDR3-2133 | Intel 520 240GB | Seagate Barracuda ST1000DM003 1TB | Corsair 400R | Seasonic X-650 | Win7 x64
Dell Latitude E6400: C2D P9600 @2.66 GHz | Nvidia Quadro 160M 256 MB| 1440x900 | 8GB DDR2-800 | Intel 320 120GB | WD Scorpio Blue 750 GB | Intel 5300N | Win7 x64
Apple Macbook Air 13": i5 3317U 1.8 GHz | Intel HD 4000 | 1440x900 | 4GB DDR3-1600 | 128GB SSD | OSX Mountain Lion