My SmartLoad dryer is 12 years old, has been my daily driver for the duration. I like it very much. The design/mechanism seems clever and performance is excellent in my experience, although others here have opined that it's nothing special.
I refurbed a Whirlpool Catalyst pair in 2011 for one of my neighbor's rental properties. There are threads/pictures somewhere in the archives. Also a couple later repair threads on the washer (transmission and drain/diverter valve). A full Catalyst cycle is on my YouTube channel.