I would be interested in comments about trading listed securities on the NYSE where a specialist processes the order vs. trading the same securities on ISLD. Currently, I trade 1000 share orders on NYSE, so there's a $5 fee/trade on NYSE that would not be on the ISLD order. What about partial fills? When I deal with the NYSE, if I get a partial fill, I just cancel the rest of the order and resubmit a second order with a new Qty field. I have heard some horror tales about partial fills on ISLD leading to an oddball quantity of stock that you would be stuck with because no one wants to buy it from you. Speed of execution should be much faster on ISLD, and seeing the ISLD "book" for the stock should be useful. Finally, what percentage of listed stocks are traded with decent volume on ISLD?