We are looking for an online card sorting tool and have recently had the opportunity to try UserZoom at my company. We found that UserZoom had many drawbacks that, given the cost, makes it less than ideal for our purposes.
Please let me know if you have any experience with using OptimalSort and what your thoughts are on the tool. Also, if you know both products, please let me know how OptimalSort compares to UserZoom. We are interested primarily in card sorting, but also looking for more information on the entire suite of features wtih OptimalSort in order to weigh the overall benefits of the product.