Thought I would chime in here as well...
I had Def Techs about 6 years ago before I went to predominantly 2-channel. In my experience, they were very good speakers for home theater and just OK for 2 channel. The bi-polar design seemed to lend itself to directionality for movies, but not very good imaging/layering for 2 channel. I upgraded to Legacy Focus and now have Legacy Whispers for 2 channel. Absolutely no comparison in 2 channel and the Whispers are also way better, to my ears, for movies.
My system has evolved pretty radically during this time from Sunfire gear to higher end components as well (VAC Phi 2.0 tube preamp, McCormack DNA-500 amp, APL'd Denon 3910 source, Elrod Statement and Epiphany X pcs, Virtual Dynamics Revelation Sig Ics and Revelation bi-wire speaker cables, etc., etc. etc......)(it never ends....)
Summary - depends on what you want to listen to - if its mostly movies, Def Techs are fine, but just not as sonically revealing as good "2 channel"-type speakers, IMHO.
I had Def Techs about 6 years ago before I went to predominantly 2-channel. In my experience, they were very good speakers for home theater and just OK for 2 channel. The bi-polar design seemed to lend itself to directionality for movies, but not very good imaging/layering for 2 channel. I upgraded to Legacy Focus and now have Legacy Whispers for 2 channel. Absolutely no comparison in 2 channel and the Whispers are also way better, to my ears, for movies.
My system has evolved pretty radically during this time from Sunfire gear to higher end components as well (VAC Phi 2.0 tube preamp, McCormack DNA-500 amp, APL'd Denon 3910 source, Elrod Statement and Epiphany X pcs, Virtual Dynamics Revelation Sig Ics and Revelation bi-wire speaker cables, etc., etc. etc......)(it never ends....)
Summary - depends on what you want to listen to - if its mostly movies, Def Techs are fine, but just not as sonically revealing as good "2 channel"-type speakers, IMHO.