I've been using pleated  3M filters  in my furnaces since I built my home in 1996 .
I have gradually upgraded to higher MPR ratings  as they have become available and am now using the 2800 healthy living filter in both of my systems .  I'm extremely happy with this product and both subjective and objective findings suggest that these are high-efficiency filters .   As an allergy sufferer I've noticed greatly diminished symptoms and moreover surface dust on furniture is much reduced .
  I also have a Dylos  particulate counter that confirms much reduced dust levels. 
 I was initially concerned that the 2800 filter would clog more readily and need more frequent replacement then the lower rated filters .
This has not been the case however ,  as airflow remains excellent which attests to the high capacity of these filters .