I bought the GE water softener and had a plumber install it. Total cost was about 1000.00 for the unit and installation. I got the 43,000 grain unit from the GE employee discount site for about half the price of what Home Depot was charging. Check if your company participates, since the participant code provided in previous threads seems to have expired. You can also buy the Fleck unit online if you want.
Never had a water softener before, so can't compare between different brands, but I can say that water spots have greatly reduced vs. not having a softener, and my skin is not as dry and itchy. Since my plumber did not hook up the softener to not soften water in the backyard, I use potassium chloride pellets so i don't kill my plants. KCL pellets is about 25.00 for 40 lbs, vs. sodium pellets which are 6.00 for 40 lbs. I put in about 80 lbs of KCL pellets every 3 to 4 months.