Just thought i post a quickie regarding a replacement dash cam for my dead MiVue.
I've now got the Garmin 56 hard wired in and can happily confirm its great.

Positives
No sucker mounts - a 20p sized magnetic metal discs sticks securely to windscreen (spare provided for dual car use)
No sucker marks on your glass. The disc stays, the camera is removed in 2 seconds
Pivot mount is smooth allowing easy adjustment for field of view
The cable is fairly small diameter allowing it to be hidden easily behind trim
Speed camera detection alerts are great (screen turns red if over the limit)
Playback via smartphone link is great.
Software is easy to use
Images top quality 1080p
WIFI connection to smartphone transfers images
Lane detection and collision warning are good but can be turned off if you wish
Its small & discrete
Can be combined with second camera in rear
2yr warranty from John Lewis.

Negatives
UV filter (protects the lens) is not included

Really pleased with the unit.