For whatever reason, there's also a vendor that sells you each tier of the back piece using the tickets you get from crossing over a division as currency.
As for the current league system overall, I could make a blog post about it. Short version: I overall like it. I'm glad the base encouragement is "play three games a day," (Edit: This is important! It's not win three games a day but play) and I think it was smart to make most of the divisions easy to get into for a majority of the player base. In some ways, especially with the repeatable final division, it's like they added a bonus reward track, or you can see it similar to prestige levels in Call of Duty. And at the end, there is a leaderboard for guilds which works like a grandmaster league for the system.
Complaints will come later.