The only paid group leaders that I would trust are ones that have a huge number of Twitter followers and tons of great reviews, likes and retweets.
That's the whole idea!
We do not offer our own signals, we collect signals from dozen of most popular sources and make them available for users for a small fraction of their original price.
And if you are interested in a signal provider that is not currently available, you can always propose to add it(just write to an online admin).
And if enough people are interested we add it!
There are hundreds of signal providers out there and you never know which ones are decent before trying them yourself. We simply allow people save a lot of money and not pay for them individually.