+1 on Addie.   Very very good support, and top notch components.  We have a large Addie unit at our dairy and it has performed flawlessly, and was way less money than the Culligan at my house, which has been a pain.  Then the Culligan service people are brain washed and think they have a far superior product and think they never fail.   Several brands use the same manufacturer to make the components in their softener.  Fleck is one of the component mfgrs.  Last I knew, Culligan did not make all of their own components, but yet they are unique to their softener, and therefore, expensive.  

A couple people mention the twin tank Kinetico.  I am sure they are a quality softener, and charge a very premium  price.  Most softeners regenerate at 2 am, and that is because most folks are not using water at that time.  They can be set to regenerate at any time, but that is pretty common.  While a softener is regenerating, any water used would be bypassed, and therefore, hard.  With the twin tank setup, when one tank is regenerating, the other is online to provide soft water.  It sounds important to some people, but in reality is way overrated and unnecessary, and the homeowner is buying a lot more equipment to make that happen, IMO.  

The connections where the softeners get hooked up are not standard, and therefore, it makes it difficult to switch from one brand to another easily, and most people would be required to hire a plumber to hook one up.  

I would recommend buying one with a meter on it so it regenerates on demand, as these will use less salt and will waste less water.  Set up correctly, a single tank setup will have a RESERVE built into the system, so if the softener thinks it needs to regenerate today, you still have enough soft water to make it until 2 am when it would regenerate next.  A good water filter placed ahead of the softener is highly recommended.  Small particles can stop the meter on any softener.  Good luck