I've been running the Dual mechanical timer version for nearly two years now, but I will never buy another one like it. I had both timers quite switching (the timers still spun, but the power switching stopped working) before the first year was up so I took it apart and messed with it a bit. Both timers worked after reassembly. A few months later they quite again. Another disassembly/reassembly and they worked. A few months later the Actinic/moonlight timer quite switching again, but the daylight timer still works, so I use it to run my cooling fan and bought a pair of IceCap digital timers to run my 660 ballasts.
No trees were harmed in the writing of this post. However, several electrons were GREATLY inconvenienced.
"If nobody makes you do it, it counts as fun." --Hobbes the Tiger