Well, the standard checklist basically is that you check the reputation, regulation, safety, security, variety of platforms, variety of assets, quality of service, customer support, trade execution and so on. This broker sort of pass all the tests with flying colors, so that's your hint to pinpoint the fact, that it is quite a nice broker.

You can check out all licenses this broker possesses. In fact, it's enough for an ordinary trader to become convinced in company's trustworthiness.
However, if it's not enough for you, then you can also dig some more legal information. FxPro is a broker that doesn't conceal something from its clients, so it provides a full access to all demanded data.
Open demo account, try trading on it, then open a real one and deposit a symbolic sum. Then try to withdraw profits. I bet you won't have any issues as the company is reliable and knows its business.

Register a real trading account and try to trade. Thus, you will know the truth..