Product review (5 stars): great price and fast shipping
Don;t really know if these filters work because I don't know how to tell that.  However, the price was great (beat our local prices by 50%) and the service fast.  Would highly recommend this purchase.  The filters do grab tons of dog hair (and you can actually scoop out the dog hair- we have four dogs and a cat).  They last much longer than the smaller filters and came with a great review from our local HVAC company that charged us twice this price for them.
I would recommend them and would highly recommend this source for purchases.