Customer service is virtually non-existent. Over a number of weeks I sent a number of emails requesting assistance first diagnosing the problem with my zip 5 then after I found the problem without help from MGI golf I sent emails requesting guidance on the correct replacement part. Emails went unanswered and the phone numbers indicated on the website did not work, continuously got a message "you have selected an invalid option" when the only options are number 1 or number 2. I ordered a gearbox described as appropriate on your website for the x3 or later models while a gearbox for the x5 is not an option on the gearbox page of GCI Golf.com. In the last year I have had to replace two MGI gearboxes, the quality of MGI gearboxes is poor. The chat option is totally inadequate and continually shows that no one is available to communicate with.