A lot of chapters need to be purchased, obviously they need funds to keep up the quality and work, so this may or may not be a good thing for you.
As for the load next chapter function, it is really bad while using landscape view on an iPhone, as you cannot use the pull down function with the already limited space. This brings me to the second point of the landscape view, you barely have any space on your screen as the header and footer are about the same size as 1/3 of your screen.
However, if you can bypass these issues it still has some good content for free and tracks what you have read and where you’ve left off well.