I have a Genie and an Hr24. When we upgraded, I asked the installer if having the Genie would be required on the road, and he said yes - if you wanted to use one of the small tuners. I asked him to leave the HR24, and we take that with us as we travel.
I have a standard definition dish (18" round, single LNB) dish I setup when i'm on the road. It takes me about 10 minutes to setup the tripod and the dish pointed correctly to get the signal.
I've not tried the HD signal yet, but it seems that it would be worth it if I spent a lot of time watching TV when I'm on the road.
Josh