I have been using the jet integration for about 2 months now. CedCommerce has done a great job in helping me to get up and running + continuing to make enhancements to their app. The app works well and I would recommend others try it out.
Great way to get products uploaded to Jet quickly and efficiently. They helped with the API for my store (www.bluebangle.com) which has over 4000 products. I would not have been able to do this without this app. Customer service is excellent -- they are online and interactive -- solving issues and making changes on the fly. Highly recommend.