This device does what it says. Especially valuable are the automatic daylight savings time adjustment, and the automatic sunrise/sunset settings. Another nice feature are the two grounded outlets that let control two devices, like a lamp and Christmas tree lights. What is not so nice are the instructions and the lack of a convenient over-ride switch. The instructions are printed using extremely small, hard to read type fonts. I had to scan the instructions into a photo, then insert the photo into a word document, increase the size and then print. Then I could read them. The next problem was reading certain words on the screen during setup. The screen is not back-lit so you have to have good lighting and possible eye glasses or a magnifying glass when you are programming the device. The instructions are not intuitive, so you have to follow them very carefully. Unfortunately, you may have to wait for certain events, like the next sunset, to see if you have programmed it correctly. It took me three days to get the programming correctly. I have set it to turn on at sunset and turn off at 10:30 pm. The sunrise and sunset times are not accurate for every location. You have to add/subtract some minutes to get your exact sunrise/sunset times stored. You can find the exact times for your locations on the Internet. Debugging is a problem. When the device is plugged into a wall outlet, usually near the floor, you have to get down obn your hands and knees with a flashlight to read the screen which faces outward. True, you can just unplug the switch and lift it up to eye level to read it, but that can be cumbersome if you have other device plugged into it. Since it is a set it and forget it device, this is not a problem except for one circumstance. If you want to force the switch on, like on a dark and dreary day, the only way to do that is to change the "Mode". Unfortunately, like most mechanical time switches, there is no override 2-way switch on the top of this device. There are 6 modes, one of which is "Forced On". That is the one you want. The problem is, you have to repeatedly press the mode switch to get to the proper mode. Even more confusing, there are two ON modes, ON which is forced ON permanently, and ON-AUTO, which is ON until a contrary scheduled event. If this sounds confusing, well, it is. Now you are finished reading on a dreary day and you want to turn the switch back to its normal Mode. Again, down on you hands and knees with you flashlight to set the Mode. This time you want OFF-AUTO, which turns the switch off until the next contrary scheduled event, in my case, Sunset when the switch will turn the lights back on. All of this could have been avoided with the installation of a simple 2-way override switch on the top of the unit. So if you have an application that requires a set-up that you will very infrequently have to over-ride, and you need automatic sunrise/sunset adjustments and automatic daylight saving time adjustment,and controlling 2 devices is helpful, then this switch is perfect. If you need a switch that is convenient to over-ride on a regular basis, I suggest you stay with the mechanical devices or find one of these electronic ones with an over-ride switch.