I have a corsport and although I love it..I would never recomend it to anyone. I bought the package with the SS and the bushings. I say go with TWM...here's why...
When you remove your knob, and the whole base to install the short shifter, their is a little blue plastic cap. Everyone here knows what I am talking about. You have to remove the cap, put the short shifter on and then put the cap back on. The thing is, the corsprt shiftr doesnt come with anything to ehlp you. The TWM one does. It comes with a little tool that allows u to remove the blue cap in seconds. Making your life so much easier. The fact they include that alone makes a world of difference on their service in my opinion. I will never recomend corsport SS to anyone based on that alone.
hows that for a honest write-up
edit: I do not know if any other brands come with the tool I am talking about.