One big concern. It feels extra bad when connection problems happen in clash. Neither Riot nor the players have complete control over the quality of the connection. If I had to purchase tickets (or pay anything) to participate in clash and then connection problems ruined a game, it would feel really bad.
Last night, my teams ADC had 400 ping for the first 10 minutes, after that he was back to normal ping. But despite our team actually being ahead in that time, once the team fights started we couldn't catch up. My team was looking forward to it all day but we never had a chance.
Other than that, clash was awesome. Can't wait to play again.