gpilling - 4:40 am on May 12, 2009 (gmt 0)
We tried some and were unimpressed with the usability. With one of them , a user couldnt tell when they had added something to the cart. In a trial, I was surprised to find I had pushed "add to cart" 20 times without knowing that it had worked. Your mileage may vary, of course. Try them and see.