I bought this unit for a home of 5 people that like to take frequent showers. I went with the dual tank because our area has high water costs and often imposes mandatory water rationing. The major benefit to the dual tank is it only recharges when it needs to. That means less water and electricity wasted. With a single tank you have to schedule a recharge time and this may be before you actually need to recharge it or after its been pumping hard water into your house. The other benefit to a dual tank is you never have hard water going into your house because it will switch over to a fresh tank immediately.
I chose the Fleck brand because its a well known brand that is reliable and the parts for Fleck water softeners are well priced and found everywhere. Many of the softeners offered by "water softener companies" will have very specific and proprietary parts that are expensive to replace and hard to find. With a Fleck system you don't have to worry about that you can find all the replacement parts easily online and even here on Amazon.
Install for this unit was very straightforward I do wish they offered left handed models where the inlet/outlet yoke was on the left hand side to reduce the length of pipe run needed for some applications. I also wish they offered yokes that accepted 3/4" or 1" pex since pex is used for all the houses now and is really easy to work with. The installation/user manual was decent enough and explained all of the programming parameters. I purchased my unit from AFWFilters and they included their own installation manual which helped a lot. If you are doing the install yourself I would recommend purchasing another yoke of the size that you need because the threads are made out of plastic and very easily cross threaded or stripped.

Pros of this unit
-Fleck brand is reliable
-Fleck parts are easy to find and cheap to purchase
-Unit is well made
-Well priced for the performance you get
-low operational cost

Cons this unit
-threaded yoke is easy to strip
-no pex yoke
-programming it may be tricky for some folks and may require looking up on youtube.
-no left handed hookup configuration

Pros of dual tank
-water/energy efficient
-no need to schedule recharges or set a vacation mode
-no interruption of soft water
-lower operation costs

Cons of dual tank
-takes up more space
-higher initial cost

We replaced a 20 year old single tank system with this unit. (Had help from experienced water treatment installer) Everything went well with the install. UPS did cause damage to one of the tanks and I contacted company. The customer service is BEYOND 5 STARS! My concerns were immediately addressed. They stayed in constant contact with me until the new tank arrived in what I consider expedited time. The type of customer support provided will have me recommending this seller for years to come! Thank you! Dual tank is so nice! No worries about contaminating the system while it regenerates! Our old system was WELL overdue for replacement but I do hope this one lasts as long!

Simpler, clean, well designed and quality build. It's easy to install and set up. I highly recommend it.

Endless supply of water.

Does an excellent job