I havn't had the opportunity to listen to the 5.2's yet, in fact I'm considering getting the Energy Encore system, but I just read a good review of the 5.2's in Sound & Vision magazine.
I had the opportunity to e-mail Energy a couple of months ago and Joe Fraser of Energy Speakers mentioned the Take 5.2's improvement over the original Take 5's but said that the 5.2's are still not of the same level (up to the qualitity of) the Encores.
