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A lot of people use those ebay duplexers with a lot of success.  Really the only issue with them is that they don't offer as much isolation as better, more expensive ones.  If your repeater is on a site where there are a other repeaters, this could be a problem.  However, if you're just building a home repeater, it will work fine.  I plan on using one of those for the D-STAR repeater I'm building.