I recently acquired one of these items. It was pretty much a junker for someone because, in my extremely limited know how, have "determined" that it had a burnt out transistor and that was causing it to longer work. I got in touch with Presonus and they will fix the unit for $65 bucks, including shipping costs, parts and labors. Seems reasonable to me. I am just wondering if anyone has used these units and wonder if it is worth it. Thanks for any input!