I've used Laser, Lightspeed, Anvil, and Blackwood over the years. Blackwood is probably the worst one of the bunch, or at least it was a few years ago when I used it. Anvil, as a software is good, but if you are a remote trader, you are going to have connectivity issues every now and then but their tech guys will swear to their mother's grave that the issue is on your side. Lightspeed is good overall but it had data lag/cross quote issues during heavy volume spike. Laser, although its UI is not as well thought out as Lightspeed, has excellent stability even during fed announcements.
