IIRC, the higline to spec from new was about £50.00 and the MFSW about £300.00.
I spoke to a local stealer and he agreed to put a new hiline cluster in with labour and programming for £355.00. This was before I managed to track down a used cluster from fleabay.
As regards functionality, well it obviously gives you the overview graphic of the car showing which door is open but also the following:
Access to the convenience and lighting menus, which allows you to change things like:
auto door locking - unlocking
whether the drivers doors only opens on the first click of the remote or all doors.
The coming home / leaving home auto lights and their delay.
Turn on or off and change the delay of the footwell lights.
It also has new menus items that the midline doesn't have such as:
If you have factory Navi unit, it shows the turn signals on the display as well as the road name and compass.
In radio mode, it shows the radio station playing, or if on CD or Ipod, the track number, as well as let the MFSW control track advance.
If you have a BT phone kit fitted, then you have a dedicated phone menu, which shows the phonebook of the mobile it's paired with, caller name, missed calls, etc.
All in all not bad for only a £50.00 option at the time of ordering. Like you JPC, I wish the original owner of my motor, who specced everything else (leather, cruise, Climate, Winter Pack, Storage Pack, 18's, centre armrest), hadn't been so tight and just spent that little extra !
I think one of the reasons though why so many cars come with midline, is that the highline option wasn't very well advertised. Even my local dealer didn't know it was an option until I pointed it out to them !
Cheers