Since the upgrade, my TS data has mostly been precisely in sync with IB. There have been a handful of periods when the charts were updating slightly behind the actual quotes: Bid/Ask/Last data on the Order Bar kept up with IB, but the charts would briefly stall. On the other hand, there were also a few notable instances when my IB connection went out completely (leading to log out/log on and so on, with at least one substantial delay getting back), but my TS connection remained fine.
Altogether, I would call the upgrade quite tradable - not perfect, but, then again, what is?
I prefer TS to TWS as a trading platform as well, particularly after setting up my basic set of orders as macro buttons - though I have had occasional problems making the Order Bar "active" for other types of orders (you click on it and nothing happens or there is a delay - can be disconcerting). I haven't been using it long enough to determine how much of a defect this is.
Otherwise, for my style, the extra 40 cents a side is fairly trivial, especially after including software and data costs. When TS gets its market depth data (bid/ask size will be adequate for me), I'll probably just keep IB available as data and brokerage back-up, and for spot checking.