PD 6 documentary

Hi, I wanted to know any opinions about using the PD6 for a reality tv
style doc shoot I'm working on. I'm concerned about the ruggedness of
the machine, the ease of use and reliability on the job, and also the
length of the DVD discs/battery life.
 We're following a family of bail bondsman around in both their home
life and their work life. About once a week we go on fugitive
recovery's which involves a lot of running about, up to 4 people on
wires and a boom, and currently a mix down of these tracks as best I
can to 2 channels. I'm trying to have no more than 2 wires on one
channel and use the boom as much as possible- this isn't always the
case.
 I'm concerned about using the PD6 especially in terms of the limited
battery life and having to carry around and change the disc so often
that I may get caught out, as opposed to going wireless to camera with
a dat backup, tried and tested but only two tracks.
Any thoughts would be appreciated. Thanks.
James