Product review (4 stars): so good. Installation was fairly easy with the exception of ...
Only had it installed for 6 weeks,  so I could not give it five stars to see how long the unit will last and the quality.  So far,  so good.  Installation was fairly easy with the exception of informing the DYI folks you need something to keep the pressure tube attached to the side of the 4 inch pipe.  I used my trusty duct tape,  but there should be a more secure option to come with the kit considering the overall cost.