Rift Herald: I like it
As a counter point to the "OMG so OP, nerf plz" threats that keep popping up, and as I suspect that players who like it are less likely to post:
I really like the new rift Herald. Yes, it can be powerful if used right, but between, say, infernal drake or rift herald at 10-19 minutes, I prefer infernal drake, and it is not much harder to take if uncontested (can be a little easier or harder depending), so I don't think it is the most valuable objective on the map, hence not OP in that sense. If the other team is asleep it can win a game singlehandedly. But that is probably just speeding up the inevitable.
What I really like about it, is that it adds strategic choices. Do I go for it or go for dragon? Or take a wave of cs/a few camps, or maybe push a tower? Where and when do I summon it? It's effectiveness depends a lot on that! And for opponent's team, how to defend against it. I like the strategic choices it involves, and I feel the reward is appropriate for the risk/effort for taking it at that point in the game.
I feel it can be improved in a few (minor) ways, but that deserves its own post.
P.S. What i do not expect it to do is to make botlane "as important" as top. It is fine though, the whole reason why botlane usually has two people is because it is more important (near dragon). And when that became less relevant, lane swaps became more prevalent in LCS, hence the botlane tower nerf to nerf lane swaps. So as long as riot do not want lane swaps, botlane will be more important than top. But that is fine in my book.