Ryan,
I've had P2264 for a couple of years now and I've put about 15,000 miles on her. First off let me say I absolutly love her, I something happend to her I could not get another one fast enough!
That said, they are definatly not daly drivers for several reasons.
My car is an SPF mk1, with an RBT-ZF and a Roush 342R.
I have put Dynamat to cut the noise, a good insulation material to help with the heat and I have replaced the firewall window with 3/4' Lexan which made a huge differance in noise. With these improvements it is much quieter and cooler but it still is not a daly driver. (quieter is a relative term, it is still loud)
First off your wife/girlfriend will not like it, It is fairly hard to get in and out and due to the design of the doors, they need to open almost all the way, so that leaves out most side by side parking. There is virtually no storage, and as you noted the windows do not open.
It does attract a lot of attention, I do not find that a problem except when drivers weave around trying to get a better look or shoot a pix of you. As noted before rain water can be a problem.
Ryan, these cars are wonderfull for the right person, I've wanted one for 40+ years and knew what to expect and for the most part have been pleasantly supprised. Its easy to drive, being so light it almost impossable to stall, with 425lbs of tourque it really does not matter what gear you are in and its handeling and breaking are supurb!
But, I'm afraid a lot of these cars are bought by people who think they want one but it turns out that their too hard to live with. This accounts for the fairly high number of low mileage cars available out there. (the same can be said of Ferraries and Lambos).
I would suggest trying to find someone in the northern US to give you a ride before you make up your mind.
As far as track days go I probably will not. I use to race SCCA back in the 70' (C sedan, mini) so I'm fairly fast and understand what goes on, but quite frankly this car driven to its limits goes quite a bit faster than I'm prepaird to go.