Top 3
1. Looks are #1 on this list for sure. There aren't many cars on the road that looks as unique as our z's do.
2. Trunk space. I dare you to find another convertible sports car with as much trunk space as our z's. It make driving the car practical. BMW really did a good job here in designing such a great retractable top.
3. Overall handling and performance. Regardless of model, 2.5, 3.0, M...there's pleny of power and great handling on all of them.
Bottom 3
1. This is 2.5 specific. They really shouldn't have even bothered with a 5 speed manual. Considering the gear ratios are nearly identical between the 5 and 6 speed, the only real difference is the .85 ratio of the 6th gear. Both have 1.0 for 5th.(yes, the rear gear ratio is different but they could have could have still done this with 6 speeds across the board). I'd love to have had the cruising gear.
2. run flat tires. These just have to go. I understand that they want to keep trunk space. But the price of rft, their rough ride, and how much they make the car tramline make them a poor decision on a sports car. Which is why the M's don't have them!
3. Cost vs. quality. Really for how much BMWs cost, they should be more reliable. We all have warranty stories over little items. Not huge deal while under warranty, but these things should be a bit more refined. Plus I plan on keeping my car indefinitely so I'm dreading repair costs when the warranty is up.