I would also like to know about the DELE exams if anyone has taken them and what to expect. Hopefully somebody eventually responds to this!
I did some snooping around. Google DELE exam and you will get their website. Looks like you can choose the level at which you would like to be tested. But how do you decide what level you would do well at? You can view sample tests and see the difficulty of each. Personally, I think I could handle C2, but I'm too scared to try. Maybe I will see about doing it at the C1 leve instead. Check it out and tell me what you think.