Thanks for your help. I called Yamaha and they said for regular maint. that anyone on their site would be fine to use.

He pretty much said that all those extras just mean that someone from that repair shop attended classes, seminars, training etc.

Hated to be paranoid about it but I plan to keep this boat for at least 3 more years and I need it to last. I dont want to cut corners or anything. thanks for your help!