I just replaced a failed KPL. It took me about 10 minutes total.
The KPL controlled a load and also was programmed to control a Z-Wave dimmer, a Z-Wave relay that controls an exhaust fan, and another (Insteon) relay in another room that controls another exhaust fan. The latter two are timed via programs and variables.
After I shut off the breaker, removed the old KPL, wired in the new one, and turned the breaker back on, the last step was to right-click on the failed KPL, and choose "Replace with", followed by choosing the new KPL I had just added. This took less than two minutes, required no intervention on my part, and flawlessly updated all the settings, links, and programs.
Priceless.
-Tom