I dont own either car but I have test driven the ms3 and test driven the cobalt ss and red line ion. The cobalt sucked and starting having engine issues ( great way to sell a car). The sales guy even told me that I was making a mistake and this car was poorly built. On the other hand the redline ion drove a lot better. The car reved nicely as compared to its twin ( cobalt ss). The looks of the car was probably the only thing that I didnt like. By the way I have tested two cobalts with identical problems and was told two different times by the sales guy to not purchase the car. Now as for the ms3, and I thought that it was flawless, but in the end I decided to keep my problematic msp ( car is almost paid off and I want a lexus or infiniti m35).
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