With a price you really can't beat, and search functions (in most readers) that make up for the slightly disorganised layout, SR5 Core Book is a good buy.
As I said the layout can be troublesome for players familiar with D&D3.5 or Pathfinder as occasionally you will find small but relevant rules tucked away in sections that do not necessarily corespond with the rules themselves. However, a searchable PDF does help here.
The game itself is great, and while the rule complexity can slow combat until you're more familiar with it, it is totally worth learning. The base rules, lore and equipment available in the Core Book are a great starting point and let you get a good grip on the game before investing in the other SR5 titles.