@gigiv
It's good to know that you use 7% in the Boy Go with success. I'm still experimenting with mine. I looked at the return process, which seems straight forward but the customer has to pay the upfront shipping costs and then ask for reimbursement. It works well enough for me. One note, it looks like Amazon.de has removed the Pari Boy Go from its site. I'm glad I got it when I did despite these start up issues.