I have used protrader GR8 before ETG bought them out. The platform cost was $250 per month (which includes your data feed and your charts and chart studies) and the minimum ticket charge was $4. So if you scaled in and out and were looking for small profits, the commissions were too much. I don't know what ETG charges today.
If you can get through the initial set up with what I felt was less than able tech support and the learning curve, it's a great platform, especially for swing trading. There are many positive features of the system and if you need to know more, please PM me. But I am probably not going back there for my own reasons. That's why I am looking for another platform.
A high speed interconnection (512 or one meg) and your own static IP address are a must if you want to stay connected with their server.