There are two fundamentally different philosophies behind removing a Sea-Doo 325's speed limiter, and understanding the difference helps explain why one feels more reliable day to day.
Continuous Manipulation
One approach continuously alters the GPS signal reaching the ECU, which means the deception has to keep happening every second the vehicle is running.
A Single Unlock
The other approach, used by the M-JET Speed Limit Remover, changes the setting itself once through the app, so there is no ongoing signal manipulation happening at all.