Hmmm.... really ??
So how many businesses do you know with an affiliation to a monster or anything relating to it?
domain.monster?
Monster Domains would be better.
In my opinion it has limited potential because unless you are looking to name your business something related to monster then the extension would have no interest. Other than to domainers of course who will probably end up funding the entire extension in the end.
My opinion is stick to .com and ccTLD's when possible unless the gTLD has a definite (premium) business application. Caution is the word with gTLD's.... think twice before clicking the purchase button, one can easily get carried away and then comes the big drop.
Talking about drops.... keep an eye on .dev the drops should be in full swing soon.