I'm going, along with one of my co-workers. Last year was my first time and I thought it was awesome - I learned a TON, especially in the labs. Looking forward to seeing the preview of BES 5.0 the most.
I have been to all previous WES. It is a very good networking opportunity and finding out what your peers are doing is very valuable. Some of the breakout sessions can be good. Last year it seemed many of the sessions were geared to people new in the Blackberry arena. For those of us that have been doing this for years, there wasn't much new. I think for Developers, people looking for something beyond email, or someone new to Blackberry, it is a very worthwhile event. I don't know yet, if I'm going. Without NJblackberry there, it won't be the same for me!!!