Most Tint shops these days are cutting tint with a plotter so there shouldn't be any problems there. If you are looking for a dependable Tint shop, call a BMW or Mercedes dealership, or another high end shop, and ask who does their tinting. They always have customers that want to buy their car with the windows tinted, so they will have a good source.
If you do a search for "Tint" on this site you will find some other threads that might help you out.