The fixation to the seat is not quite possible with the tethers and Kunststoffhäckchen, the seat cover is especially on the seat but also in the back area for short and narrow, slip especially easily by as the cable outlet or the cable is not from the seat surface but from the back comes. This pillow is "drawn" on this side down. The cable is also to make it to lay long borderline "favorable" to the power connector. The connector slides over time (after a few trips) a little out of the socket of the power connector, which means that it does not heat.
So overall greater power connector in "squab" straps with variable Velcro closures, a 20 cm longer cable and a better matching plug in and it would be useful.
By the way my car is a Toyota Yaris, so not a very big car, I grow bin180 cm.