Hi
The connection is exactly the same, but they will insist you have it installed to ensure that the box to card pairing, V+ features, return path for 'on demand' & the TV picture are set up by the technician. (well that was how mine was done, he didn't leave until it was all working & ran me through the basic features for watching & recording tv)
- the upside being if it goes wrong, they can't say it was because you hadn't installed it correctly
