From NHL.com:

The gold standard of deadline acquisitions this season has to be Chris Stewart, however, whose remarkable start with St. Louis is helping Blues fans forget about Boyes. Stewart has an impressive seven goals and two assists in nine games since the trade.

Two defensemen who were traded for each other, Kevin Shattenkirk and Erik Johnson, have been productive in their new locales, but it's yet to be sustained. Johnson has four points in his first seven games with Colorado, while Shattenkirk tallied three points in his first four games with the Blues only to go pointless in the five games since.

Not too much to add here as it is way too soon to evaluate the trades. What I would say, is that if EJ played as well as he did against San Jose, I will be a happy bunny. The upgrade on defence seemed to be enormous. His positional play was superb and it took the sting out of this trade. If, however he regresses to play every game like the one against Edmonton, then, I will be really disappointed.