Pros-
invades are super easy to do against low hp champions/assasins post 6(often leads to kills)
Great Jg clear early- Late game
Insane Chase (due to items and her W)
Insane Defense
Ultimate becomes game changing due to knock up plus slow from the FM.
Does massive damage in team fights with Cinderhulk, W , and E (in dragon form).
Hybrid of Fighter/ Magic damage out put so no true counter with any build.

cons-
Timing is important
Build is always changing order based on champions fed on opposing team
Ult needs to up in order to get the most out of the champion.
Usually gets focused due to initial engage (sometimes a good thing)
Must Change Build if more than 2 tanks are on team. (for instance Chogathe mid/ Tahm top/ Naut support/ No reason to go tank if this occurs or anything like it. Must go Straight Glass cannon. and yes this is rare but it does happen )

Always start which ever side you can get a gank, from that side work your way like you normaly would any other champion. Always smite first monster so its either gromp/golems. When ever a champions leaves lane from your team if you see them backing go to their lane. VERY IMPORTANT you dont need stacks from devour so you can get an exp boost by spending time in their lane which makes you Waaaaaaay more deadly early to mid game. only leave if you have to so when they return or if you are low. Never go into a lane if there is a threat of you feeding that lane.