Be careful if you have GFI circuit...
343088
I love these Intermatic switches and wanted to use on outdoor LED lamppost.  I had to return this switch because it kept tripping my circuit breaker after about 15 minutes.  I talked to their tech support folks and we finally concluded it was due to it having a GFI on the circuit.  He suggested I could use a different switch with a neutral (if there was one in my box).
If I could have made it worked, it would definitely have been a 5 star.  Just wanted to warn you if you trying to use it on a GFI circuit - talk to their folks first!
4365637
Reveived the heater and began reading instruction manual. Quickly noticed that this unit cannot be used with GFI, in an RV. I ordered it to use in my RV, so after reading the many, many restrictions to using this product, I sent it back.
1750286
Our power glitches a lot and the freezer GFCI often trips.  When we hear it beeping, we know it's time to reset the GFCI.
3898216
Just received the UVP-9
9 Watt UV Sterilizing Pump

plugged it in ran fine for 3 days then when I was installing a new heater, I got a huge shock! unplugged the sterilizer, and the water was fine.

Now I know why my GFI was tripping.

Test your water with a meter and be safe.
1947764
I have a NAD T758 A/V receiver plugged into the master outlet...after working flawlessly for an hour and a half, the unit shut down and now the outlets that are supposed to be controlled by the master aren't unless I unplug the unit for at least a half an hour.  It has a burnt smell coming from near the power switch, so I'm afraid to use this product.  I'm outside Amazon's return policy, so I fear I'm stuck.
4502884
BE WARNED, this unit requires non-standard wiring to install! The power consumption is 29 amps on a 120v line, which requires 10g wires. This will not work on a normal 120v line! This information is found in the enclosed owner's manual, which you will have to open the box to read. Once opened, the company will not allow you to return it! Stay away unless  you want to rewire!
1626614
May have to try different outlets but works well when an outlet with little interference is found.
3034009
issue with an internal power limiter blown can melt the switch
must be replaced along with power limiter
3387266
The circuit tester works fine. It trips GFI breakers and provides validation that you have wired your outlet correctly. My problem is with the breaker locator. I bought this unit specifically because of this capability, but when I try and locate a breaker switch, it certainly send a signal, but the receiver goes off on virtually every breaker switch in the box regardless of the sensitivity level setting. the orientation of the receiver makes some difference it seems, but still will not isolate the signal to a single breaker switch or even a small group of switches. I expected that once I switched off the correct breaker switch, the signal would stop (no longer powered) and it does, but there seems to be some residual power in the device and it does not stop immediately, but give it a few seconds to confirm you have the correct switch. So the tracer is useful in that way.
842262
JUST WENT THRU ALL THIS MODEM CRASHING THING TODAY!! I READ ALL THE REVIEWS AND DECIDED TO TRY A NEW POWER SUPPLY ON MY OLD 2 WIRE THAT HAS GREAT COVERAGE EVEN FROM ACCROSS THE STREET ALL AROUND THE HOUSE! WORKS FINE NOW!! POWER SUPPLY WORKED!! PLEASE BE ADVISED IM TALKING ABOUT THE OLDER 2 WIRE!! IM POSTING THIS REVIEW HERE IN HOPES PEOPLE WILL TRY THE POWER SUPPLY TRICK BEFORE GOING OUT TO BUY A NEW ONE LIKE THEY RECOMMEND, I HAVE HAD THIS 2 WIRE FOR YEARS WITH THIS BAD POWER SUPPLY BEING THE ONLY PROBLEM!!! GOOD LUCK!!!
1747720
I am in San Francisco Bay Area, using Comcast cable modem. After installing this device, my internet connection stopped working. It seems downstream is okay, but the upstream signal has problem. After removing the device, my connection works just like before. I was hoping this device can get me a better upstream power level since mine is at the boderline, but no luck for me.

On the side, watch out for the 75 ohm terminators seller offers. For my case, I was not paying attention, just click what seller recommended and trust the PRIME label. I ended up paying $9 shipping for a $3 parts. Amazon said it is my fault, and yes it is. But how can Amazon allows seller to put traps to trick Amazon's customers. Who's fault is it really??
480267
Beware!! My electrician had run this hdmi cord all the way to the basement & remounted television before we realized each end is different. One is the input and the other output (usually they are the same!!) Had to redo the whole process.
4110600
I thought I was "upgrading" my surge protection when I redesigned our home office last year. Turns out I was signing the death warrant for my work and personal laptops. The "green power" on this baked both machines from the constant cycling. I started hearing a high pitched whine periodicaly in my office last week, and couldn't find the source. Well it popped and ruined two pcs. I am LIVID.
1598805
Good product and we use quite a few in my company to extend client networks.

To understand it's limitations, you have to understand how it works and how your home is wired.

Most homes are 2 phase circuits, basically a 220 volt input that is split into two 100 volt electrical paths (or phases). My house has 2 stories, so one phase is the top floor and another on the bottom. The two phases are separate, so they do not "touch" each other electrically. This means a Powerline adapter plugged into my upstairs phase can't talk to one on my downstairs phase. It can't, they are part of two different circuits.

The communications signal is converted to radio waves which are sent through the house wiring at low strength. It can't be a strong signal as that could overload the wiring or breakers. That signal needs to overcome line noise which could come from DC motors on the circuit or faulty cabling. The longer the distance, the more the signal degrades and the higher chance of interference. The receiver has to pick out this signal at the opposite end and convert it back to data. If the interference is bad enough, the connection drops frequently.

An electrical circuit is a hostile place. The Powerline adapter is using a high voltage circuit as a conduit for data communications. To do this, it must expose it's transceiver directly to high voltage. A surge suppressor would filter out the data signal and render it useless. If the house wiring isn't stable, surges and spikes can fry a Powerline adapter in a few seconds. You won't know until it's too late.

As someone mentioned, these things are basically a gamble. Sometimes they work, and sometimes they don't. Unless you hire an electrician to trace your wiring, you won't know if the circuit path is adequate to push data. So, try not to destroy the box when you open it, and be prepared to return the unit if it fails to work. Check the unit occasionally to make sure it isn't hot, and disconnect it when you don't need it.
Don't expect this to be a solution, just a temporary fix until you can run some wire.
2214774
There is no longer a Firewire 400 connection from the G-drive mini. G-tech customer support told me that the Firewire 800 was backward compatible to the 400 on my PowerMac G4 (OS 10.3.9), but when I plugged the cable into the back of my tower, I heard a loud electrical "crack"! (Neither my computer nor the G-drive was turned on).No damage done that I know of. I then tried the USB 2.0 connection to my USB 1.1 on the tower, but no icon came up on my desktop. This device was supposedly pre-formatted and desktop ready. So I then tried to format it in my Disk Utility, but the progress bar was so slow that it seemed to have stopped completely. I'm returning this to the Apple store on Monday.
4584489
I discovered one of the batterys had the wires hooked up wrong so it was the wrong polarity.  As such, it fried my DFD f181 circuit board when it was plugged in.

TEST the batteries prior to using them, and pay attention to the polarity.
4259176
I guess I should have read all the other comments more thoroughly.....the voltage spike is completely unacceptable.
This problem does not appear to be limited to a board here and there so I recommend you don't press your luck and fry your
components in the process.