Now I have tested it. First I changed 0.1 bitcoins in Dash, than 0.5 Dash in XRM and last 1 Dash in XRM. Everything worked quickly, cleanly and without problems. In all transactions the coins were in minutes on my wallets and the fees are allways only 5%. Very fair! That's exactly what I was looking for I think I´m staying.  

Edith: 0,5% and not 5%! Sry.

I discovered Changelly today and I liked it from the beginning. Very uncomplicated and easy to use as it seems to me. I think it is very anonymous and unregulated especeally if you want to change cryptocoin to cryptocoin. I will try it first times with smaller amounts and if everything works well I´ll increase the amounts gradually. Since I´m searching for a trustworthy Exchanger I found such as Cryptonator and Livecoin and  I like them too but at first I think I´ll try it with Changelly and I hope Changelly proves to be safe and confident. If everything goes well I will stay with it