It's owned by the Winkelvoss twins (the ones Zuckerburg fucked over for making Facebook). It's been around for awhile and is very well established. However, you don't own your crypto if it's not in your own personal wallet. Get your crypto off of the exchange so you don't have to tell others down the line "yeah I lost all my crypto from an Exchange". The only time you should ever have your crypto on an exchange is if you want to make a trade right then and there. After you make the trade it should be moved off immediately.