I know very little. If you are looking to be around other traders, I don't think they have any/many physically there. My understanding you must use their proprietary software, which is always negative to me. Don't think there is any training, so I assume it's for experienced people looking for funding and infrastructure.
My opinion they are legit and "clean" after they were fined awhile back, so no questionable strategies.
I have found several people on LinkedIn, so maybe you can try contacting them.
All I got.