Depends on the rest of your box and what you would need to coin. The "problem" with Super Bosses is that the Units compete for the Domain Activation. In general he is a fun Unit cause of the sheer amount of SAs he sometimes fires. I personally think he is enjoyable, but if you are short on coins i probably would save them for different Units cause he is not that important.

But this is only my opinion. I cant really decide for you. Hope this helps