I never use any of the bots, for me bots must be open source otherwise I can't trust them though I don't look at bots, some might be open source as well. In some situations, they are really good.
Yes exactly, don't use bots you didn't code yourself. Even if it's opensource, someone can predict how the bot is going to react by studying the code, and manipulate the market to take advantage of it. This is why my bots are only for my own trading activities.