It is as safe as any other performance option with the same stop margin. Its main use is to clear obstacles faster and therefore allow more payload on an obstacle limited runway, so the choice is either take the payload or reduce it and do not use improved climb.
If you use it mainly to get a bigger thrust reduction it is probably even better than that as your airplane doesn't weigh as much as the case where you absolutely need to use it and therefore stop-performance is better. But that is just guessing on my side.
Anyway, i can understand a certain reluctance to use it as it is somewhat unusual at first, especially on those longer runways where one was not used to rotate close to the end.