I think part of the problem for traders is that you never know what you are going to get.
On the PSE, they just started to only allow auto-x for cleint vs client trading for ONLY the quantity posted (ie it could be less than 20). If you attempt to trade more than the quantity posted then your order goes the manual route (gets lost). In some cases you can get auto fills when the market is locked but not in others. The market makers can easily change their parameters and often do (even intra day).
On the CBOE, they just started to honor some quotes when the market is locked but once again it appears that they are rolling this feature out so it is difficult to tell which stocks it applies to. Trial and error for now.
On the PHLX and AMEX, they seem to be hit or miss. This may have something to do with WHO the specialist is but for the most part, quotes may or may not be honored even if the market is neither locked/crossed.
You usually know what you are going to get with the ISE. You can even get some auto's when the market is crossed. You just have to know which stocks.
Despite all this, it is getting better and I expect it to get better in the future. I would advise all traders who actually care to write to the SEC.
The SEC is looking for comments on the "Repeal of Options Trade Through Disclosure Rule".
http://www.sec.gov/rules/proposed/34-46002.htm
In this rule there is an implication that, once linkage is imposed then there will be no need for the trade through rule as it should no longer happen. I, however diasgree with this. In fact, it appears that nothing will really change with linkage. Please let the SEC know what happens to you on a daily basis so as to ensure that it won't happen with linkage. I have also been told that John McCarthy of the SEC's Office of Compliance, Inspections and Examinations is also interested in hearing about what really goes on in the options market.
Now, is the time to voice any concerns (before linkage occurs)