Product review (3 stars): good but overpriced
pros: works great with the HM1865 model holmes humidifer i have at home. actually, it's probably better quality than the original filter that came with my machine. . .

cons: it's WAY overpriced though.  if i could do it all over again, i'd buy it form the holmes website which has it for half the price even with shipping included!.  don't get confused by the whole 'PDQ-U' letter scheme. . . it seems to be the part number.  the box labels it as a HWF65 'C' filter which is what they are also selling on the holmes website.

5 stars for quality.
1 star for price.
3 stars overall.