i live between the UK and the USA
i have a sling box at both my houses in the UK and USA
when im in the UK i watch the USA sling box, and vi-sa-versa.
ive had it running now for approx 5 years with no issues!
depending on what you want to control ie cable box or just feed a straight cable feed to the box either will work
in my uk house i have it controlling a sky + box and in the USA house i have 2 sling box classic's one is direct into a cable coax cable just the normal channels and the other is controlling a tivo box and a cable box i normally pick the tivo box and then let the tivo control the cable box.
all you will need is the following
Internet Connection (doesnt matter if its not a static ip address as the sling software will 'hunt' the sling box down - the sling box reports its ip to the sling server and you connect to the sling server and it will then tell you where the sling box is and connect direct to it)
sling box either normal or hd (if you want to stream HD channels)
router which you can configure and open ports on
if you want anyother help give me a holla