I have a problem with the ES challenges. When I'm trying to get any version of the Cloak of the Bear, I first have to purchase the level 16 version, then use more mats and the base item to upgrade it to the level 20 version. The same goes for the level 24 version, but with even MORE mats. Furthermore, all ES challenge mats are bound to character on aquire.
And then there is the Cloak of Flames from the Cannith challenges. I can buy a level different versions of the cloak at different levels, and I don't need the lower level version to do so. Not only that, the Cloak and the ingredients used to buy it are bound to ACCOUNT, not character, allowing me to farm the needed mats with any character I want at any level.
This is a bit inconsistent, don't you think?