The steering in my 2015 ED is heavier than it needs to be, which exacerbates the feeling of understeer and an unwillingness to want to turn. The additional difficulty is that it seems to take extra force to start the turn, and then the force required dies away, sometimes causing you to turn more than you wanted to. This is especially noticeable with small steering corrections, like when taking a freeway sweeper.
That and the sidewind sensitivity can be mitigated to a large extent by getting a wheel alignment that is outside of the factory specs, which are designed to make the Smart understeer. The factory specification calls for a lot of front toe-in, around 1/4", which also causes faster tire wear. I think they can justify this setting because the front suspension is designed to run with little camber, so at least you're not grinding down just the inner or outer shoulder when just driving straight forward.
I've found that going 1/32" toe-in at each front wheel significantly changes the driving characteristics, for the better. This front setting also mirrors the toe-in setting that is fixed at the rear. Sidewind sensitivity is cut down by at least 50%, and it turns into a corner much more smoothly and with less steering effort. Rolling resistance is also decreased and tire life at the front should increase as well.
Still, before you buy, you should take a Smart for a long test drive. The steering ratio is almost tragically slow, and that takes some getting used to. With the stock wheels, there's a 4" difference in track width between the front and rear, and many times you can have a rut that catches the outside half of the front tire and the inside half of the rear tire, and that will make the Smart squirm around a good amount. Fixing the toe spec reduces tramlining as well but won't do anything for the steering ratio.