Ahhh, you may not get a discount when you "upgrade" but you also don't have the hassle of taking a day off work to wait for an installation engineer that doesn't turn up, only to find out
after he's gone that the bl**dy service doesn't work anyway, and then spending 6 hours (maybe 7) on the phone on hold for CS to get the whole damn mess sorted out.
I know which side of that deal I would rather have