Product review (5 stars): Very easy to install....quieter than previous model and clean!
So this installed very easily.  The screw holes were standard and it was easy to reinstall at the old screws.  I have had to install these where the holes were in a different place which was annoying.  All the knockouts were included so I didn't have to juririg it at all.  The only problem I had was that the previous wiring had a clip that I had to break to remove from the old vent.  When I went to put that clip into the little round hole where you put the wire from the wall it would not hold.  The manufacturer could provide a new stability clip although this was not vital to the installation,  it would be nice, since the previous installation had one.  They could have also included some wire nuts. which were not included either.  My previous install had wire nuts so I just used the old ones.  The last item that would be nice is if they had not created a situation where you have to use a specialized bulb for the lights.  the two bulb holders are a normal buld slot, but the depth of the light hole means that your regular bulb sticks out 2 inches.  If they had perhaps set the light deeper into the vent or turned it side ways a standard bulb could be used.  oh well.  I got a great deal on this through amazon I got more vent for less money than at my local home store.