I've tried many listing tools in the past and have been using SixBit for the past few years and LOVE it. It's a powerful tool that saves me time. Time is money and I can use that time more efficiently. SixBit will make your life easier and help you grow your business. AND it doesn't cost an arm and a leg like some other options.
You can easily import all of your listings. They even give you 30 days free to try it out and see if it's right for you so there's no risk.