My Personal Experience when getting into a game is that there are moments where the client chokes and stops causing me to be unable to do anything in the client. When I was in champ select for my first game after the patch and noticing that when im trying to select masteries that it was lagging to the point where I was unable to click on anything causing me to end up with almost no masteries that game.
If there is a fix to this I would love to know but currently the client update is a thumbs down for me.
This board is the best place to discuss the client with Rioters and your fellow players, although it won't be our main source for feedback resolution. Look to the other tools, like the Submit Feedback button in the client, for that. As always, please follow the Universal Rules and keep content focused on appropriate topics for this board.