I also for the "old" iPhone 4 design car kit from Navigon (now part of Garmin) had with whom I was very happy, so I ordered the "iPhone 5 Design Car Kit" at Garmin directly, which shortly after New Year came.
Basically, both kits like twins: The suction cup holder is the same, the Holder for iPhone 5 course, slightly larger.
Fits, holds, works. I'm very happy with it.
BUT: on the way to the iPhone 5 has fast times saved the charging cable. It is therefore in the package only the suction cup holder with the holding tray and a dual USB charging plug for the cigarette lighter in. Charging cable - nil. In Vorgängerset it was still in there.
So, I would recommend this kit, but with 1 star not forget deduction for the missing cable, please remember when ordering, or the Lightning cable from home while driving.
Hint: If the Design Car Kit for the iPhone 4 has: There are the Holder also available separately! But then would still remain the problem with the cable.