It worked well when we had the personnel to employ it while it was still a novel concept. Then we didn't and better coaches worked out a counter strategy. Which may well have been as simple as let us cross, win ball back, quickly distribute to quick striker and let hilarity ensue vs Egan.
It worked more times than not until we lost O'Connell and replaced him with Robinson.
Edit. That sounds harsh on Robinson, who we have now discovered (because we are doing so much better without him