If you are only going to trade the liquid futures mentioned above, they might be OK.
The price is right, but I downloaded a demo of the FireTip software in Oct or Nov (from Zumo) and was underwhelmed. They said they had just upgraded it but I didn't like it. The charts were bare bones with only a handful of adjustments/indicators and they were poorly designed - a lot of wasted space at the bottom of each chart.
The quote/watch lists were OK, the DOM seemed fast enough, but I only tried it with a couple of simple fake orders.
They had some pre-formatted futures spreads which could be a time saver, but what made me lose interest completely were their options chains, or lack thereof. No impl vol, no greeks, and a complicated, slow way of finding the (basic) chains in the first place.
So, if you're a short term trader and the price is what attracts you, maybe they're worth a shot, but they're not the place for trade research, for options, or for trade mgmt/portfolio review.