There have been reports of issues with motors and such that have surfaced here and there in the forums and in conversations. In many cases these were known bugs that had been fixed in the final release of the software that is available at the bottom of The OpenROV 2.7 Product page (Requires an SD card to upgrade).
The only known issues with controlling the ROV that I have been able to reproduce has to do with quickly jamming the motors from full forward to full back when in air and both motors don’t always respond.
If you have experienced other issues with controlling the ROV definitely let me know! Either in the forums or by commenting on the github issues I am using to track the reports I have not been able to reproduce yet: