I got my Trend in July of 2006 and have used it quite a bit so far. I
concur that the headband is not that comfortable. It would benefit from
a cushioned center band. I simply vacuum the filters as needed and have
yet to feel the need to replace either one. I've probably only got 20
to 50 hours of runtime on mine so far. However, the battery situation
was also a concern. They could significantly improve the design be
having an external jack to plug in the charger and also by having a
smart charger that you didn't need to concerned about leaving plugged
into the battery.

To get around the 4 hour runtime issue I rummaged through my bin of
miscellaneous electronics stuff and found an AC adapter that had exactly
the same mating connector as the battery. This adapter is rated at 5
VDC output at 1000 mA (compared to the 4.2v 140mA adapter that comes
with the Trend). The 5VDC may shorten the life of the fan motor since
it is made to run on the 3.6v battery pack, but it powers the fan
nicely. Now I just hook the adapter directly to the Trend. Yes, that
means I've got an umbilical cord which limits mobility. But, it means I
can use the Trend at any time for as long as needed without worrying
about having forgotten to put the battery on the charger the night before.

This may not be a solution for everyone, but it works for me so I
thought I would share it with the rest of you.

While the Trend has its faults, I am very happy I got it and I always
wear it while turning. The Triton has its own limitations and faults,
but if you want ear protection and a hard hat as part of the package it
would be a better solution. I like the Trend because it is superior
protect for my eyes and lungs than just using a dust mask and/or face
shield. It doesn't fog up at all, but the fan could be quieter.