I opted for Lightspeed when it was time to go to real money, but I did do a one week test run on Fusion. It was ok, it was a little clunky but it wasn't bad. The quotes seemed to be good, although I did get a little lag sometimes, that I don't get with Lightpseed. It does have eveything you need though.
It's servicable, and cheap (free!). It will work if you are on a shoestring budget. I think it's worth paying a little more for a better platform. (and yes I know Lightspeed doesn't have the best rep on ET, but I think it's great)