Well, I've spent the last 2 days driving my MX5, managed to do 400Km :-D
I'm in love with the handling, it's nippy, responsive and turns on a dime... Once the top is down you feel brilliant, not too drafty at all. As it gets cold at night, I just turn the hot air bowers on and actually feel nice and toasty even powering down the motorway at 70mph in these cold English evenings.
Downsides: It's bumpy, bouncy and noisy... and I've bottomed out on far too many Speed bumps... I fear I'm doing some serious damage to the poor thing :-(
Everyone should have one of these :-)