Overall feeling of solidity. Amazing seats. Great trunk space (golf clubs or weekly groceries for 3-4 people). Convertible top fast (unlike 350Z) and both latches can be locked/unlocked with one hand. Front end won't scrape (driveways) if careful-nice surprise considering how low car is. Can buy near/ under $30K if you play email game with dealerships. Lively & exciting ride at highway speeds. Excellent seat/pedal/shifter/gauge relationship (I'm 6'2", fit perfectly & can see 100% of gauge cluster-amazing job Honda!). Xenon headlights great at night. Beautiful high-quality interior. Very nice ignition key. High-strung & more race car-like compared to relaxed/pampering Boxster.
Waves from fellow S2K'ers. Special "top down" mode on climate knob great for keeping warm on cool nights/cool on hot days. Perfect exhaust volume: quiet when putting around, louder when pushing it. Plenty fast (won't beat Vettes but you can easily be 1st one off the line in everyday traffic).
Top of windshield perfectly obstructs vision of traffic lights when I'm first at red light. Ridiculously high insurance rates (get quote before buying)! Sun visors that tilt to side (currently only flip down). More interior/exterior color combos. Dealerships reluctant to allow test drives.