I recently upgraded by DC13.4 to ANR by the use of a DIY kit from Adams Aviation (£140). I wouldn't fly without it now! Excellent at reducing fatigue and also in making you feel less busy on departure/arrival as you are not having to contend with all the extraneous background noise. ATC are crystal clear and you can have the radio volume set lower.
The benefit of adapting the DC is you still get good passive protection when the battery runs out. Mine lasts for maybe 12-15 hours of flying.
If you can afford it, go for ANR if you are planning on doing a lot of flying.