Transmog rewards last longer than the treadmill of numbers on your gear. Not saying I don't like getting upgrades, but yeah. And it will be nice to not have so many slots locked down. I did like collecting tier pieces sometimes, but other times the tier bonuses were underwhelming, or changed my rotation in ways I didn't like. And sometimes it was annoying to not equip a 20-lvl upgrade because tier. I'll wait to see what they come out with before forming my final judgment.