Having previously owned 6 Taurus's (tauri?), a 2005 Five Hundred and now a 2007 Fusion I feel fairly well qualified to speak on behalf of "the taurus customer base". My wife loved her Five Hundred and was very pleased with it. Granted it was somewhat bland in appearance, but a nice safe, comfortable car. Kind of a sleeper for sure. We had planned on getting another when our 2 yr lease was up, but she fell in love with the looks of the Fusion and wanted one just based on looks alone. We've had it for 6 months so far and everyday she is more pleased with it. She says "it fits her better". Now that Ford has "tweaked" the fivehundred/taurus it will be back on our shopping list when this lease is up (another 2 yr). She really likes the nose-job it got. Of course I like the 3.5 litre. If the Taurus is priced right, I think it will be one of the best values on the road. Decent looks, reasonable performance, safety and lots of room. They should move lots of em.
The biggest problem with the Five Hundred seemed to be marketing. My wife would tell her co-workers she drove a F/H and they would either ask "what is that?" or "why do you need a big truck?"