The single biggest problem (I see) with any hybrid car are the batteries themselves. There hasn't been a significant breakthrough in the manufacturing of low cost, long life, light weight, and efficient batteries. All those batteries need to go somewhere in the car, which usually means sacrificing either trunk or interior space. They are getting creative and placing them in the frames and what not but I'm not sold on the technology just yet. Not to mention all this "go green" stuff is getting rather annoying.