I've been trading some of the more obscure ETF's and have run into a problem getting filled by the spec (Amex). Basically, they back away a very high percentage of the time, if its an unfavorable execution (for them). I read on the Amex site amextrader.com that they very proudly claim an auto-ex system (immediate fills with possible price improvement) for small orders. Mostly < 2000 shares, which falls into the category of what I'm trading. Is the auto-ex system a bunch of BS or what? I can tell you the fills , even when I get them, are far from fast, and can take at least 30 seconds or more. I don't think I've gotten an 'instantaneous' fill yet. Looking for some experiences before I call Amex and raise holy hell.