I can't honestly say I have one either way since I have never done any business with GoMax Industries, or ever had to deal with him in the forums as a "vendor" member as I have had to do with a few others that were just plain bad actors when it came to their business dealings ripping off some of our members.
Based on the mostly negative reviews I have read though, I would stay away from GoMax if it were me.
Depending on any item you may wish to order, just ask here in the forums as most of our "well-seasoned" members can usually tell you who you can deal with and who should be avoided at all costs.
As for me personally, I have been spending my bucks and recommending
https://bicycle-engines.com for motors, etc, as well as buying any other items not available there from amazon.com.