The switch itself should last for a very long time. People who had switch issue is for the earlier versions; due to the juice leaking from the atty chamber down to the switch. My theory is that running the device too hot melt the nylon insulator, shorts will melt it as well, or the insulator was not tighten down enough.
The later version had a silicon warps around the switch rod which goes into the tube inside the tank or the shaft which will prevent any possible leaking.
I bought the Orion used and was freaking out about the leaking so I took it apart to see if there is a silicon wraps or not. I was glad that I did; although there is the silicon wraps, it is missing a rod oring.
I do not suggest anyone to uninstall the Orion unless the switch isn't working but if you are really freaking out like me and want to make sure that no leaking will ever happen; please make sure that you put some vaseline around the silicon wraps so that it will go into the shaft much easier. I pushed so hard without any vaseline and broke the silicon warps..... Do clean your unit really well before you install.
If you do not have the silicon warps, DO NOT WORRY, Per Crack's advice, "Take apart. Clean everything. Especially the shaft on the orion. Put switch in. Put rod orings on switch rod and push them into the shaft from the top. Do two of them. Then put the insulator and nut on. Tighten the nut down to push the insulator and orings into the shaft. This will prevent any juice from getting into the switch bay through the shaft." Instead of 2 rod orings, I did 6 of them; gotta make sure that no leaking will ever occur. Again, I do not suggest anyone to uninstall the Orion. If you feel the need to do so, please do it at your own risk.
Last but not least, all electronic will eventually fail but Orion is a solid device and it will last for a long time before it does. To have a peace of mind, just purchase a spare switch.