I found that the Level II Quotes (through Quote.com) were 'missing data' compared to PowerView....came to find out that they were missing the participants C & P, which are probably the ECNs? .... so, Powerview seemed like a more complete form of Level II. In fact, I don't understand why I person would want Level II quotes and then ECN books on top of that.....Powerview puts it all in one place ....
I posted several messages here to hear what people thought about Powerview, but no one ever replied, which led me to believe that no one here uses Powerview, Totalview, etc....Maybe the $14 price tag will help!