So, I can deposit xp in these things but, whenever I return in a new game, it shows my balance but won't let me withdraw. What's the deal? I've been playing on 'easy', if that's what the problem is. But I'd like to know for sure.

Here's how they work. You can only withdraw xp on the same difficulty level and on the same floor as you deposited it. So it's for new characters, if you can get that far. If you're having trouble and want an extra boost.

I deposited xp in the stasis pod on lvl 10. I've gone back on the same difficulty level with different characters, but no go. I'll check and see if this patch might have fixed that before going to the official forum.

Edit: Of course I have to get back to lvl 10 first...

Edit 2: Okay, I finally get it. You have to be a lvl 1 character in order to access the pod. So you have to start on the level you deposited the xp on. They really could have made that less confusing...