I've been a cardholder at two different libraries that use the "Hoopla" app for their digital libraries. It's a mix of awesome and frustrating - if you are accustomed to Audible and/or Google Play Books, for instance, you might find the Hoopla interface less intuitive.
And the selections are often kind of... mysterious. Like, they don't have some traditional favourites (ie. expensive stuff), and have heaps of stuff you've never heard of (ie. cheap stuff).