Product review (4 stars): Quiet Good Replacement
Quiet, not hard to install, need 2 people to install, decent directions, flimsy cheap plastic bulb cover that sometimes disengages but overall it works great as a replacement.  Nice that it is convertible.  My duct work & electrical was already in place.  I used the rectangle configuration.  Can't beat it for the price.  Delivery was on-time and it was not damaged.