ASUS router device in the market seem to come and go ..... I first saw ASUS routers in early 2000, mostly Broadcom base, I was rather impressed with it's built quality and slim design, but not it's factory firmware!
I bought the RT-12 mainly for the purpose of creating multiple VLAN for UniFi. Unfortunately, it seem like Broadcom base DD-WRT device unable to create VLAN ID more than 15 :(
June'2011 update: ASUS RT-N13U Ver.B1 can be uesd for UniFi to completely replace TM's DIR-615, click HERE for more information !
My ASUS DD-WRT devices: