Brace, think about improved climb performane. We use it pretty often now, but it is somewhat uncomfortable to learn since you get very high Vrs with usual V1s and rotations in the red lights are usual even on 4000m runways in lightweight 733/737-7.
However you actually increase safety that way since you have a much better initial climb performance and with usual V1 more than enough space to abort if you get any problems before that. We are still climb limited with it, but it allows us to carry several tons extra or reduce thrust even more.