Here is an example of a kit that needs some help. From the front it doesn't look that bad except the front bumper is almost blended in with the hood:

However when you see the car from the side it looks terrible:

The wheel wells are all messed up, the door panels do not even attempt to make the rocker panel look seperate, the line in the middle of the car is ok but in the back the center line goes down and same thing in the front.

Here is a link to the add with more pictures:
It does have nice seat covers. The shiftgate is only for looks as it is an automatic.