The app is nice: it has a lot of information and is an interesting option against iOS' default app or other alternatives. However, too much data makes it messy: it's really not easy to understand what is what and why some graphs/colors are for. The layout is also a bit complicated to navigate. Finally, it costs a purchase price and then asks for an in-app purchase for more. That makes it very expensive, while I'm not sure it's worth it at the end.