i have been using my peplink balance 300 for about a year now. it just works. when my dsl dies down every once a while, the router rerouted my traffic to the wifi backup and emailed me the detail. my business has been running online all the time since installation. i setup a linux open source before, but this just beats it being so simple and stable.

http://www.peplink.com/products/balance-200-300/

i recommend it to everyone.