I hope these guys succeed. They have an good value proposition with excellent integrated charts and a wide array of order entry options. What I like is the tight integration, flexibility and not having to have third party products.
On the down side they need to have some kind of flashing button that lets you know the system is impaired or down. Perhaps a yellow light for impaired and red for down. There is nothing more terrifying than being disconnected during a trade, even if you have a stop in place. They could also use an improved system to get funds in and out.