Comparing the Trend Airshield and 3M Versaflo is a bit like comparing apples and pears!
The Trend Airshield (manufactured by Helmets Ltd) is the
Purelite XStream respirator re-badged and if I remember correctly it has a smaller capacity battery. This respirator has two integral TH2P filters. Everything is contained within the respirator so there are no trailing hoses.
The
3M Versaflo is more of a respirator system. The powered unit is worn on a belt which makes the head top very light.
Both respirators have pro's and con's.
Purelite XStream / Trend Airshield
Pros
Everything is supplied in a box. Simply charge and install filters.
No trailing breathing tubes.
Cheaper than 3M Versaflo.
Filters are easy to replace.
Cons
Although the mask is not heavy you are still wearing the battery, fan etc on your head!
3M Versaflo
Pros
Sometimes the breathing tube will snag on objects.
Can be used with an array of different head tops.
Cons
Can be expensive
Items sold separately. You will need to purchase a starter kit (3M TR-315) and also a head top.