This is quite literally the exact same as filling out a paper NavLog. There is no added functionality, features, ease of use, or calculation other than the totals. If anything, more work is needed to simply take your paper NavLog and input the data into this app.
This is only at first glance after I have only used it for a little bit, I will write a more in depth review after using it for a bit. As for now though, I highly doubt this will be something I use regularly if at all.