Vent Meiser: Pass or Fail?

This is an excellent, par-brilliant product!

We've cut our energy costs 30% + already by installing a programmable thermostat to only heat the house during the hours that we are home and active. (morn & evening)
Our final predicament is in heat distribution. Adjusting vent flow can be very delicate to balance the rooms in the house and to individuals.
If I could heat only the upstairs (bedrooms) at night, and cut off rooms that aren't in use during the day, we'd be heating half the space. Simple as that.
Of course your thermostat needs to be programmed to adjust for the heat redistrbution, in order to avoid over heating if nearby rooms are shut off, but ultimately, the ability to program not only the time and temperature, but also the zones/rooms leads to much more efficient heating.
6 or 7 of these are worth the efficiency of a brand new furnace at 1/50th the cost!

Actually, I've used the product and think it's terrific! I'm actually a little annoyed at the way the question is skewed. Actually, I use the vent miser in my kids rooms so that the heat and air are automatically cut off when they go to school, and to think that someone will go into their room as they leave and come back a half hour before they return is ludicrous.

If someone wants to cut off the vent in a guest bedroom, this isn't the product for the. The poser of the question simply doesn't understand the product.