Be sure it comes with a payment processor. Many plugins out there require you purchase a separate payment process plugin which is not good.
Also be sure to check reviews. If they only have one review, many times that is the dishonest developer pretending to be a customer and rating their own plugin, it happens sadly.
Also i might advise you really think hard before getting anything from aron. His customer service is horrible and many of his plugins dont work. Dont believe me, just ask around. I would not say anything about another developer normally but he has a very long reputation for not doing things right and not coding properly.
You might check out ostore as well
https://developers.oxwall.com/store/item/1101
Yes its mine but it works and there will be an update out i hope before the end of the year and it does both single (admin) and multi vendors (users) and it has a built in payment process already in place. You can also upload non tangible (downloadable) items for sale.
If it meets your needs great, if not then thats ok too, i want you to get what you need that will work for you. :)