Quote from IBsoft:
That is for a reason. OEX options are singly listed by CBOE. We deliberately don't route your orders to the auto-ex system, because we believe that we can often obtain you a better fill by routing to the floor broker, where the order gets manual execution.....
Quote from riskarb:
TOS in only superior in the sense that they have the ability to work an order for you on the floor. IB beats TOS as far as network and latency. TOS clears through IB so there is little reason to choose TOS, unless you need to work an order at a post or need some hand-holding.
Timberhill[IB] is the largest MM on the ISE. They're offering screen-markets on combos + spreads through the SMART-routing. It's a huge advantage to trade a combination w/o routing the order to the post and working a combo or spread electronically, w/o any human intervention.
Quote from resinate:
IBsoft,
Is this a recent change?
I ask b/c I have been trading SPX options for years through IB. Recently, I have noticed that fill reports when I hit standing bid or ask are now slow where they used to often be instantaneous. Just to be clear, they used to be slow when I would send an order between the posted bid or ask (the order would be outcried as I understand), but now I am noticing delay when hitting standing, electronically displayed orders- I am pretty sure these orders were electronically executed in the past.
Quote from IBsoft:
The change took place within the last year.
Quote from resinate:
IBsoft.
So, what you are saying is that IB no longer uses the electronic auto-ex at all? Even when the displayed bid or ask is electronically booked/quoted and the execution would be instant?
Can you elaborate further on the logic of this?
Thanks much.
Quote from zxcv1fu:
I do not know whatever your get your information from. They are not true.
This is what I know:
TOS is a broker agnostic, exchange agnostic firm and clear through Penson Financial, not IB. They have greater redundancy than most other firms because they route through many different 'pipes'. They don't accept payment for order flow or internalize order flow, the customers orders have no conflicts, better redundancy, better fills, more facilitation venues, more shows and better speed of execution and cancels (without cancel fees). thinkorswim was voted #1 by Barrons for stock and option execution two years in a row
TOS remains the industry leader with respect to innovative technology and client services. For retail customers there is no better.
You can call them to find out about the fact:
http://www.thinkorswim.com/tos/displayPage.tos?webpage=whythinkorswim
I like their platform & they provide lots of tools for free like free RT charts (stocks & options), quotes, scans, etc.
It is the only option broker that does not charge you more when you place the orders over the phone. They are answered by ex-option floor traders. You can ask them lots of questions for free.

Quote from IBsoft:
Please look at my previous posts. I explained that it only affects spx, oex and djx on cboe. The reason why we do this is that the customer often gets a better fill.
The quote that the auto-ex executes on gets fed in by a single market participant. (This is not an electronic market). The crowd often improves on that quote. We route the orders to the floor-broker, who gets to execute it in the crowd.
Sorry, but the facts are Barron's gives OX the best for Browser-based. And as expected, IB wins for SW-based.Quote from zxcv1fu:
...better redundancy, better fills, more facilitation venues, more shows and better speed of execution and cancels (without cancel fees). thinkorswim was voted #1 by Barrons for stock and option execution two years in a row
TOS remains the industry leader with respect to innovative technology and client services. For retail customers there is no better.
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