This product sucks!
It has to be installed at least 12-14 inches from the wall, they do not specify this anywhere. So this cannot be installed in a Porch light.
This is useful only if you install it on a pole somewhere out in the open
Total waste of money!

Works wonderfully, but one small blindspot
I ordered two of these for my garages, since there aren't easily accessible lightswitches from all entrances. At first, one of them wouldn't pick me up when entering from this one door, but I rotated the fixture by about 10 degrees and then it was fine; so there IS a blindspot.
I am loving them - especially when I enter the garage holding stuff, light just goes on automatically, immediately. The range appears to be great too, as I can enter from one corner of the garage, and the sensor on the other side of the garage (~30ft from where I step in) will activate.

So far, So good
After reading the reviews on this product I purchased 3 units. I placed them in 2 closets and a laundry room that previously had lights with pull strings. So far I am very pleased with my purchase. They have never failed to function properly. The only negatives that I can see are; you cannot adjust the time the lights stay on, and you cannot use CFL's with these units. Both of these issues were accurately described in the documentation, so they are only my comments, not problems with the units.

Three units failed in thunderstorm
I bought of these and installed them in the basement. The worked great for about a month. When a thunderstorm came through and the power went out all three units were fried. No other electrical devices in the house were damaged by the outage so it leaves me to believe these are very poorly made. Too bad as they were convienent. I also wish they worked compact flourescent lights. I'll send them back to BKK brands as there is a 3 three year warranty. See below for details:

LIMITED WARRANTY
Coverage: BRK Brands, Inc. warrants its enclosed Motion Sensing Hands Free Socket to be free from defects in materials and workmanship under normal use for a period of three years from the date of purchase. During the first year after the date of purchase, BRK Brands, Inc. will replace any defective Motion Sensing
Hands Free Socket without charge. During the next two years, BRK Brands, Inc. will replace any defective Motion Sensing Hands Free Socket at a charge to you not to exceed BRK Brands, Inc.'s cost. This is your exclusive warranty. This warranty is valid for the original retail purchaser from the date of initial retail purchase and is not transferable. Keep the original sales receipt. Proof of purchase is required to obtain warranty performance. Dealers, service centers, or retail stores selling this product do not have the right to alter, modify or any way change the terms and conditions of this warranty. In new construction, if your Motion Sensing Hands Free Sockets were installed by a contractor, this warranty is valid for the homeowner at the time of installation from the date of original
installation and is not transferable.

This warranty does not cover normal wear of parts or damage resulting from any of the following: negligent use or misuse of the product, use on improper voltage or current, or use contrary to the operating instructions, disassembly, repair or alteration by anyone other than BRK Brands, Inc. Further, the warranty does not cover acts of God, such as fire, flood, hurricanes and tornadoes. BRK Brands, Inc. shall not be liable for any incidental or consequential damages caused by the breach of any express or implied warranty. Except to the extent prohibited by applicable law, any implied warranty of merchantability or fitness for a particular purpose is limited in duration for 3 years. Some states, provinces, or jurisdictions do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts, so the above limitations or exclusions may not apply to you. This warranty gives you specific legal rights, and you may also have other rights that vary from state to state, or province to province.

Service: Units under warranty and in need of repair should be returned, shipping prepaid, to BRK Brands, Inc., Attn.: Consumer Affairs, 3920 Enterprise Court, Aurora, IL 60504-8132.
First Alert® is a registered trademark

Very handy but watch out!
I have a room in the basement where I keep my computer and when I leave the room at night, the light switch for the main basement is on the opposite wall. With this item, I don't have to feel my way around anymore. But, don't use an energy saving spiral bulb in this unit, it will just flash on and off, then the unit will quit working.