Product review (4 stars): High maintenance.
I got exactly what was described on the product page. I made sure I was ordering from Amazon.com and not another seller; perhaps that explains the comments of other reviewers on getting generic filters. I consider it likely that Holmes does not make the filters but rather licenses its name to other manufacturers.

My major complaint with these filters (and the humidifier) is that it requires 20 minutes of maintenance per week, and an extra 20 minutes per month on top of that. If you don't do the maintenance, the filter lasts <2 weeks before molding, as opposed to the mfr's specified 6 weeks.

I cheat on the maintenance by putting a little bleach into the water 1x/week (about 1 mL bleach per tank) and running it until I can smell the bleach. Then I change the water. This procedure disinfects the machine and filter. The downside to this procedure is that bleach is corrosive, and will probably kill the motor eventually. But it's been through one winter and hasn't died yet.