Average app if you compare with other, but decent , good interface, relatible fast transfers and buying , a bit slower on the withdraw option and there are some fee wich is expected , just pay attention to all the "small writing" if you understant.
They are improving with each update, and they also update on twitter how to crypto coins are doing in that specific day.
I think they have mostly of the coins that are worthy at the moment.
Also they sometime have some giveaways if i remember corectly.
You should check them first , on website , twitter and compare to other apps and then proceed for signup if you decide to