Smell is part of it, but it's also a rudimentary car in every way.. no conveniences, and not something I would take my kid for a ride at any great distance (safety, smell). It's hot and loud and fast, which is awesome fun for me, but my 2 young kids are growing and I figured if I had something newer and bigger (m6 for example) we could use that car as a family weekend warrior. Taking the z out of the garage is almost a chore for me, so I don't use it to run errands and stuff like that. Also with the smell and noise, I don't take it any place 'nice' if that makes any sense
There are no problems with the car itself, it's very well sorted and I consider it a more or less complete project.