Product review (3 stars): Excellent delivery but not quite what I thought I ordered.
The order was delivered one day ahead of scheduled period.  However, my order was placed for an Aprilaire 50 Sensing relay but the unit delivered was from Generalaire.  I haven't yet installed it and it may very well work as it should.  The ad should have stated that it was a Generalaire unit, not Aprilaire, which is misleading.