I know from the posts, that several use ISLD, and apparently quite regularily. IMO, almost always the prices shown on ISLD (and other ECNs) are not the best as compared to the MMs. I believe that Dustin said (or implied) that this wasn't a real concern, as the end result was that he could get a real buy and/or sell price. Is this normally true (in other words, try to avoid the MMs by use of the ECNs---especially ISLD? Like some comments on this---especially in regard toward short sales.