I believe CalMetal stated it best; what is your application.
For a car that is designed to be run in the 2500 to 6000 RPM ( or more ) range these are a good, but expensive, choice. Some formula car or a track car where there are a number of turns and bends.
For a car that will be driven on the street, oftten, these can be a headache. They are very sensitive to dirt, fingers ( people playing with them ) and gunk. They are a true racing atomizer, but can be a low RPM problem.
Just my $0.02
