My guess is the kamtec (spelling?) shells selling for cheaper were a problem. People were complaining about the lack of window masks, door trim decals etc. I dont care for those as I will gladly pain the trim myself and would rather have the perfectly scale body.
A lot of people does not seem to notice the huge difference in accuracy between the retroracing shells and other escort shells. Like how the rear bumper, front bumper, and most importantly the side door and fenders, all have their lower portion coming back towards the inside for a proper and scale accurate shape. The vertically flat sides of the kamtec shells completely throw off the scale look imho.