At first impressions it seems like a good idea. Companies either side of the pond can trade across the pond without incuring taxes etc.
The problem comes when you get into the detail. Firstly US labour costs are much lower (due to no holiday pay, maturity leave, working horrific hours etc. etc.) so they can undercut European companies. The European companies cannot compete because of the sensible labour laws that people have fought, voted and in some cases died for.
Secondly existing legislation can be overuled and new legislation reject on the grounds that it “harms trade”. These laws tend to be things like don’t use stuff that kills people in baby food.
The whole thing is going to be regulated by some sort of overarching regulatory board. The board is made up largely of the big companies pushing for TTIP.None of it seems very good for us, European, or indeed workers in the US.