From what I understand (based on the research I've done on this topic), Intermittent Fasting is useful because it plays on the natural up and down swing of your body's endocrine system by manipulating calorie intake at specific time intervals to allow optimal peak testosterone and GH levels and maximizing insulin response.
If your natty, it would be a good tool to use. I've used it with tremendous success.
But if you're on cycle, its damn near pointless. Your test levels aren't fluctuating much, allowing estrogen rebound. Also, the GH to Insulin ratio wont make any significant impact on gains given you are dosing synth. test at (give or take) +400% of natural production.
If your body is in a constant state of hyper-anabolism then take advantage of it.