This is lightweight and keeps my face visible and my ears exposed - I can use my stethoscope,  hear soft voices and see very well.  I am a mobile physician and spend the day in the T-200.
After about 50 hours of use the 2 parts that click together lost their snap and the  pieces would not stay together; the integrity of the system was compromised.  To get through the day I upped the airspeed, which worked.   Later I wired the pieces together to restore function.   I have used T-200 assembly and drape for over 100 hours now - the headpiece is so comfortable I have forgotten I had it on site.  
When traveling with the headpiece, there are several problems.  I find that the location of the air hose prevents me from using a headrest.  When I sit in a car or airplane, the hose pushes my head forward and prohibits the head support needed for long or rough travel.  The T-200  has excellent visibility- but  I cannot drive with the using the T-200 assembly because of the hose location prevents a full sit back in the seat.  RPB is good about improvements - I hope they will advance the T-200