is more like; refunding all silver without doubt.
since if you ever get the same class as before; you will be able to level all the attributes you had before.
but if you choice a complete new one, it would not make any sense for them to give money to upgrade as well so you will have to PAY, from 0.
this works well; because it would allow us to optimize our builds when there is nerfs-buffs, but the core of the build would still be the same since would be to expensive to lose all the main class attribute; but circle 1class that we take as filler-supp, can be changed without penalty, since normally we do not invest in attribute for them!
i can say; that IMC really have put effort in it;. because if you can only reroll one or two circle to make you class better; you will lose almost nothing;
But if you want to complete re roll a entire class to a new one; you will have to start from 0 attribute; so it may not be worth to do so, would be better to level one from scratch.