Can you (or someone else) explain in more detail how they operate (e.g. how do they make money), when their best time is to make money (markets going up/down/sideways?), whether there is a risk that their large dividend yield could be paying partially with a return of capital, whether they have a limited life (and consequently, one should be careful of buying when the market price is above the NAV), etc.?

I've been following BEP for a while, as I have ETV & ETW, FFA, IGD, and MCN