The version I'm using has real-time data but there's no live order-entry functionality at the moment, so I can't really comment on the IPro route at this time. The L2 seems to be working well and the account management tools, integrated web browser, and research features are also up and running fine.
My comment regarding MB taking a couple of months is speculation, but I think it's probably pretty accurate. I mean, if they were going to release this product in a week or two, one would think they should have no problem committing to a release date, even if it was only tentative.
As far as choosing between TerraNova-MB and CyberTrader is concerned, I would choose TerraNova-MB in a heartbeat. In my personal opinion, CyberTrader's software and their data delivery infrastructure has never risen to the level of maturity and reliability that RealTick has.