I agree - the panorama roof does not necessarily equate to living in a greenhouse - the shade has proven to be adequate (with the A/C on), and if we get another record-setter this summer, I will probably put an insulating panel in place.
Things you need to do or consider before buying a smart:
1. How often do you NEED to carry more than one additional person?
2. How often do you NEED to carry large amounts of packages/luggage?
3. (Assuming you are a relatively young male) How secure are you in your manhood? (I have heard a LOT of young guys express doubt about being able to show their faces around their friends - they think the smart two whimpy or something. Trust me, it isn't)
4. How big a budget do you have? They start in-expensive, and even the fully-loaded Cabrio isn't all THAT expensive, compared to the starting point of a lot of cars.
5. How interested are you in "improving" your car? (Like, do you want to make this a project, or just drive it as-is?)
6. Do you like to talk to strangers (perfect or otherwise)?
7. Can you answer perfectly inane questions with a straight face, when necessary? (Like, as you are filling the tank at the gas station, someone walks up and asks if it is electric)
8. Does the thought of being able to do a u-turn instead of a k-turn excite you?
If you like it, and can afford it, IMHO buy it.