I made a research for my case. I bought XAUR approx. 1 year ago. If I now melt these XAUR for 1g gold bars and sell the gold (36.5EUR per 1g bar at local dealer), I will get more money than I invested 1 year ago. And the gold base behind XAUR can only get bigger. This means that the only possibility to lose my money is a big crash in gold price, which is very unlikely.
Of course, melting is the worst-case scenario as selling the XAUR on the market is currently much more profitable than melting it.
What I am trying to say is that buying XAUR was a great investment.