It's a very good twin tank softener. Probably fairly pricey. It's sold by very few dealers compared to other brands. It is very unique.
Unless you must have softened water 24 hrs per day, meaning your household has someone up all night using water, you don't need a twin tank type softener. A correctly sized regular softener would regenerate about once every 7 days for an hour and fifteen to thirty minutes from 2:00 AM. If you went with a regular softener, I suggest one with the Clack WS-1 control valve. It is the best for a DIYer because it is so easy and fast to repair. That is by design. Anyone with apair of channel lock pliers can totally rebuild one and have their water back on in less than 30 minutes. Even if they have no mechanical ability; all they need is the desire to fix their own softener when needed.