I've always wanted one and being that I can hook up the lap top at work I thought now was the time. Working third shift I'll miss Monday night football, Thursday night NCAA football, etc. so this could help. Well, my brother has an ancient router with his Vonage (they gave it to him for free) and it just wasn't working. Needless to say I was annoyed. Taking the advice of a coworker of Ben's (my youngest brother) at CC I re-hooked everything. I took out all the ethernet cords from the Vonage router and hooked them all into my Lynksys Wireless N router and then hooked a line from it into the "internet" port of the Vonage router and hooked only the phone line into it.
Thankfully that worked!
The Slingbox did everything for me once I had a modern router hooked up which was very nice.
Now I am watching my Comcast DVR anywhere I go that has high speed internet, including my work place! It's a very cool invention and I am glad I finally picked one up. If you've ever considered one I highly recommend them, just make sure you have a modern router!