Strongly advise anyone who is researching this company to do more research into this company.
All I am going to say is that I am surprised that this company is associated with Home Depot.
Water softener and filtration is a bang-bang product with plenty of literature available. Provided you are in the city and getting city supplied water, the water quality to your house are published values by the city, no one really has the need to come to test your water unless you're using a well or other source.
A good system (installed by professionals) including a water softener, reverse osmosis (for drinking water) will cost about $1,500 to $1,600 (it's cheaper if you buy the parts and install yourself if you have the know-how). The system these guys are pushing you for are in the range of $5,000.
I regret starting my research at Home Depot and hopefully this comment will prevent readers from going through the same mistake.