I'm a firm believer that you should only put as many compounds into your body, as you require. Even when utilizing a hormone that converts to estrogen, I defer the use of an AI, unless it is a necessity. When off cycle, this seems foolish - unless the use of the AI is required to keep your estrogen within range. Perhaps, if this is a consideration, you should pursue some bloodwork before making a decision.
Keep in mind, low estrogen is certainly just as bad as high estrogen (if not worsE). There is a range you want to keep your e2 within.
I think it's a good ideea for people who do not want to cycle.
Offcycle AI's can raise natural testosterone output and increase fat burning.
I recomand Aromasin so there is no rebound.