1- I would say XEO, on average I'd say 1500-2000 contracts per month. There are a few reasons for this: A) they have 5 points increment and SPX usually 25. B) Like I said I hate those smurf size orders and there are some on SPX. C) The XEO is generally less volatile. D) Its easier to get fills, I suspect the MM uses my volume to hedge his OEX positions that have usually more OI. I also trade the NDX and RUT and I really wish they eventually come out with weekly's on them. 2- I have traded XEO on thursday's (rarely) but I have never traded either on expiry day, I don't see myself as a day trader. That is not to say you shouldn't for some reason but I stick to what works for me. 3- I really don't know what type of "client" they were targeting when they launched these. I do not seek volatility, I seek positive e(x)