I did a quick check on them and the info I got says they are designed for hedging needs of institutions. Are they viable as active trading instruments or strictly for the big boys hedging?
Quote from maninjapan:
is there any specific reason one would trade them over the regular monthlies?
Quote from arizonadreamer:
The quarterlies on the SPX have a European style expiration. You don't have to be concerned about the occasional madness of opening settlement...
Quote from MTE:
I'm not sure what you meant here since all SPX options are European style not just quarterlies and all of them go through the same expiration process (the settlement value is calculated on the opening print).