This is a very easy timer to install, and I am happy with it.... I basically just removed the plate, unplugged the existing wires, and plugged in the new ones. Had to fiddle with the grounding wire a bit (not an issue with the product....it was an issue with what was available in the junction box), but eventually managed to get a good connection to the existing grounds. This outlet supports both screw type terminals, and plug in terminals for 14 gauge wire (14 gauge max size for plug in terminals). No neutral wire is required. Apparently, the NEC allows you to also not ground the thing under very specific circumstances where a ground is not available. I had a ground available, so I used it. Note the following: This timer has a maximum current load rating of 5A (~600W). It is probably not appropriate for heating lamps (at least, it will be a close thing for these items - check your application). If you have a very tight fit in the junction box, you have to remove some metal fins from the side of the switch, and this will reduce the load rating by 1A or so. The timer has good features - you can use the rocker switch on the side to adjust the timer from 5 minutes to 60 minutes. It also has an "manual off" mode, activated by pressing the switch twice quickly. This turns on the switch until you manually turn it off. Nice feature.... It has an "off override" (used when changing lights, etc.) to ensure that power is shut off to the switched circuit. There is a little plastic piece you pull out from the front of the switch to activate this mode. On the negative side: The switch feels a little bit cheap and rickety....it's not super "solid". If you place your finger on the switch and move your finger slightly, the plastic switch will move a little bit...it's a little bit loose. Not a big deal, and I don't have any concerns about longevity/reliability - it's just simply an aesthetic issue. I haven't measured this, but I think there may be a very small (less than 1W?) amount of standby power used when the switch is OFF. It feels very slightly warm to the touch when the switch has been off for a while. Again, I'm not sure about this. It also may be normal for these types of switches. For certain, there is some loss in the switch when it is in the ON position. The switch warms up slightly when the switched circuit is drawing current. Not sure how much loss there is, probably a few % of the load wattage. I suppose this is normal for these types of switches, but I don't really know. ----------------- Edit: This switch is still going strong. I like it! I recently discovered (reading documentation on Lutron website), that there are a couple of nice features that I didn't know about, which can be useful in certain situations: - You can make sure that the timer ALWAYS reverts back to a certain "timeout" period (say 15 minutes), even if someone manually adjusts it one time to make the period shorter or longer. This is useful if you have kids fiddling with the lights, or someone who doesn't know how to use it, and they accidentally adjust the timeout period. This way, you don't always have to be adjusting it back to the right setting (say, for a bathroom fan, you might always want 30 minutes of run time). - You can override the "double-click" function, which normally turns the light on without timer (it stays on until turned off). If you always want the light to turn off, without the possibility of it staying on indefinitely, you can change the mode of the switch so that a double click will result in the maximum timeout period (60 minutes). Both of these modes are accessed via a relatively simple programming sequence - pull out the FASS switch, hold the switch button down, push FASS switch back in while continuing to hold down switch button for 5 more seconds. Then you use a sequence of pushes and selections using the small rocker switch to navigate through the "menus". See the Lutron site for more information. I didn't see this information in the manual that came with the switch....
