Subwoofers

I just plugged them into the system,  I'm going to have fun playing with them.   I can tell a difference immediately.  I'm listening to Art Pepper now sound is much fuller.  Will have more time this weekend to adjust them and position. 
Thanks for all the input everyone. 

Mike 

As akg described well, the 2wq subs avoid the major historical problems with sub integration. I run a pair of 2wq subs with Quad esl speakers and the sound is so good i stopped reading speaker reviews. The speaker system seems to have unlimited potential so i just focus on other parts of the system for upgrades.  The integration is amazingly seamless especially considering the speed of the quads and difficulty mating to electrostats. I like the sound much better with the 2wqs. The acoustic space is much more apparent especially on live recordings with the subs and obviously the extension is night and day ... I cant say enough about Richard Vandersteens design on these. I do not understand why everyone is not talikng about 2wq subs more often.

Meant to specify i am talking about quad esl-63 speakers in my above post.

Nice post, Montaldo. I agree with your perceptions.
Vandersteen subs, coupled with the m5-hp crossovers, make for a seamless integration.