what should i do with flower spikes?

[Matt]

3 of my phals are finishing blooming. 2 of them had bloomed a few months back and after blooming i cut the spike back to the first flower node. i was hppyto see a new flower spike growing about a month later and they have flowered well. should i continue to cut the spike back to the node or the plant or should i just leave them alone? is there any benifit to any way?