I've been using Helium 10 (Diamond Plan) for 3 weeks now. For some reason it doesn't work for me (I can't select any of my products so I can't create any ad campaign). I communicate it on day one but I didn't get any answer yet. So, my 30 days money back guarantee is almost over and I've not even been able to try Helium 10. I asked to extend the "trial" period (because I have not been able to "try/test" it yet) but they say it's not possible. Conclusions: 1. A lot of money for a tool which does not work (yet). 3. If you have a KDP account, you can't use the most of the tools but you need to pay full price. 2. Zero compression/attention from the support team (all that they do is to tell you "I have scale it to the development team; doesn't matter what you ask them). Kevin Albert