It appears to be a cross between RediPlus,Lava and the watcher. A very solid product for NYSE and Nasdaz scalpers. Looks like they have bullets built into the system, and NYSE openbook and the new NYSE liquidity rollout. Apparently, Carlin has spent a tremendous amount of money on the product and have alot of SD's working on new rollouts. I have beta tested the product and have seen it live. I'm just waiting for the rates to come down before I join Carlin.
Software is pretty stable. Insufficient bells and whistles - no charts yet. Good for risk management. Rates are not the cheapest because they clear SLK.
Although I have not used the system, Ron Shear CEO (last that I heard) was / is a trader. That's very important, when a hands on CEO trades.