Beautiful looking car judging by the great pictures
Your findings align with mine following one hour test drive although that was in the manual version. Didn't enjoy the exhaust note so much though with an annoying drone when at town speeds. Never heard the stereo system but with door speakers in a proper cavity would have expected better than the footwell speakers in trads.
Ridiculous and unfinished seat belt warning situation. On my Roadster there is only a driver's seat warning sensor so that works fine. If MMC were obliged to fit sensors to both seats, its a no brainer to include passenger sensor as well.