Screw lock connectors are Towers' version of EZ connectors. Either type will work OK for a trainer, but do not use them on high performance aircraft. They are well known to let the control rod slip a little or a lot at the worst possible times. They also have been known to remove themselves from the servo horn, in flight! They are not permitted on giant scale planes at IMAA events for that reason.

As your knowledge and ability increase, look into using locking clevises of one sort or another on future planes.