I've had an AquaRite AQR15 for 11 years now. I love it. In fact if the whole system died today, I'd buy another tomorrow. My first cell lasted well over 7 years, and cost $400 to replace. That makes my chlorine cost less than $57 per year, and that's for a 19,000 gallon pool that's open year-round in very sunny Tucson!
The input resistor on the main circuit board did fail at about nine years, (which is a common problem on the earlier units), but a $2.50 part and 15 minutes with a soldering iron put it right back in service. I like many others here recommend the AQR15 as a solid choice for a SWG.
Oh another advantage is, unlike several other brands, you can adjust the output in one percent increments without the need to be controlled through an automation system.