i have 4 of these, WR703N. the 4 meg is what limits the potential of its development. i now use one as a network extender for my garden with an external antenna mod. and i use one as a NAS with external HDD on my network. this is the firmware i am using:
https://forum.openwrt.org/viewtopic.php?pid=150596
aka The Big Squeeze
P :)