upgrading kernel issues question

[CaperAsh]

After reading Linux Lite kernel post, I began to wonder about the pros and cons of upgrading kernel. Some comments in that thread expressed pleasure in improved performance with 3.15 (the general one, not the LL one), and now I gather there is 3.18 available. Before experimenting I would like to learn the pros and cons of doing such a thing.

Any advice, or is there a basic policy for LL2 which is taking care of that sort of thing automatically with the updates routines?