Could anyone please explain to me how SOES / SELECTNET fees work. I understand 'normal ECN fees' and additional fraction of a cent for passing through. Now some ECN's are paying to add liquidity(ISLD), I also understand this. What's so special about SOES / SELECTNET that I have to pay cancellation fees. I don't have to pay them at other ECN's Also their pass-Throught fees are much higher. Do I have to use SOES / SELECTNET ? What are the advantages ? Can I trade all stocks if I decide not to use these ECN's ?