Had a great experience last night. Traded keys with a fellow roadster owner last night for a 20 minute drive. His a roadster 1.5 and my 2.5. Anyone that is thinking of purchasing a roadster 1.5 based upon drivability should consider the 1.5 as a perfect solution. After a nice drive, we both concluded the only difference appeared to be the audio system and the instrument cluster. We both preferred the 1.5 instrument cluster. The 2.5 has a much improved audio. Suspension and acceleration both seem identical. Both cars had the HID headlight upgrade. The only other difference appeared to be the stick shifter versus buttons which both serve the purpose. I don't know the differences mechanically, but both are amazing fun vehicles to drive.