To let you know I don't work for the firm, but here is what I trade at (remote).
Yes SIPC
Regular 4 to 1 intraday 2 to 1 overnight (regular retail account)
Ecns are extra
Base is $0.0035 per share
Bullets are $.015 per share
Software is free, but I do pay $100 per month for the VPN
Charting is poor so I use another platform (my execution platform and charting do link to each other )
No billable orders...they have their own dot interface (yes they do have NX)
I have used redi plus, realtick, gr8trade, tradecast, watcher and cybertrader. None worked as well as the platform I'm currently using.