I have had this car for 2 days now and I love it. I'm only 5'8" so space is not a big problem even though getting in an out of a low car is interesting. I feel the car fits likes a glove. The best word to describe this car is FUN! I live in the SF Bay Area and plan to drive this everywhere including along PCH1, Napa, and Santa Cruz. Having the retractable hard top is convenient and allows me to have a quieter ride if I prefer. It also provides a sense of security vs. a soft top. Be aware that the recommended fuel octane on this car is Premium (91 octane).
I only have a little over 100 miles on the car but so far I can tell you this is a true sports car. The handling is right in tune with a car of this type. Power and torque is there when you need it even with the auto transmission and paddle shifters. The ride quality is what you would expect from any good sports car. Firm! I had a 3 Series BMW before the MX-5 and it will give the BMW a run for its money in every way for about $9 grand less.
The MX-5 with power hard top draws a lot of interest. The top works easily and I don't notice the extra weight. The trunk space isn't compromised either. With the top up, however, there is a huge blind spot on your left side so adjust the mirrors carefully. I'm six foot three and I fit comfortably. The copper red mica is attractive without screaming "look at me". The engine is willing and scoots quickly. The transmission shifts lightly, but even with the 6 speed, it seems like it needs another gear when cruising on the freeway.
I owned many of the British cars of the late 50s and 60s and in many ways this car reminds me of them. Putting the top up is a one hand operation but the improvement is that you don't need a snap on tonneau cover to make it look good when it's down. I think for the money that the MX-5 roadster is one of the best buys out there.
I've had my 2007 Miata PRHT for about 3 days now, but already find this to be an amazing vehicle. It's a real pleasure to drive and the PRHT is definitely worth the money -- much quieter than the soft top inside the vehicle. I've owned a 280ZX, an MGB, an Acura Integra LS, and most recently a Toyota Celica GTS. The Miata is far and away the most fun and responsive vehicle of the bunch. Go get one! ;-)