I've been on board for 2 hours and I already have very positive first impressions. I have twice the amount of leg space than on the bus and the cost for coach on a train isn't that much more than a standard bus fare. There is a constant internet connection, although the speeds will vary since they use the data connection from various cell phone towers. Streaming and downloading isn't allowed in order to conserve bandwidth but if you are l33t hax0r, then you can figure out a way around that.
Pros: Plenty of space, constant internet connection, cafe car, wall outlets, no rush hour traffic to worry about and gorgeous scenery.
Cons: A bit more expensive than a standard bus fare.