Dukascopy is definitely NOT the best broker! I have used them for 6 years now, due to various reasons I can't get away from them because I always has trades open...
The main problem that they have are the slippage on the quotes. You don't get fill at the market price as seen on your screen. The price you actually got filled to closed is always up to 1 pip 2 pips different. At end I have to put the specific price in the order tab!
Also about the amount of orders (the lot size), it is very difficult to manage. If you don't be careful, it will ended up taking 100% margin! After all these years, I still make this kind of mistake. When this happened, i chicken out and close with a big loss! It takes me days to build my equity, just one stupid error, wipe off all my earnings in one go. They are still one of the scam bags!