A few questions about the Smart 451

We want to buy a new Smart on Monday (451). Therefore I have a few questions: 1. How is the new Cabrio roof? Is it about the material and the technology like the old one or has it done something? The reason for my question: we have the 450 as a convertible and with the roof a lot of trouble: At first it was leaking, now it is dense but it whistles from 80 km/h extremely loud. Besides, it smells enormous with sun exposure. 2. How about the power steering? In the current Smart we don’t have one, that’s right. But the new Smart has instead of 135 tyres at the front 155er. There should be a servo (we drive a lot of city and use narrow parking gaps) after all, or? 3. Does MHD make sense? 4. What should you do not miss out on? We definitely want the Passion. 5. In my opinion, the 451 with 71 hp goes worse than our 450er with 61 hp. Should you take the 451 with 84 hp? However, then the consumption goes probably towards 8 liters… Many thanks in advance for your answers!