With my new Pure AV AP30800-10 I dont have to turn anything off when the power goes out unless its going to be off for awhile. Also keep in mind that if your VCR, DVR, ect looses power while you are away it wont record your shows. You want something to keep them running for as long as possible. The Pure AV also looks cool. Also it outputs a sinewave not a square one. This is important.
Check out this rather "stale" thread:http://www.avsforum.com/avs-vb/showt...tion+Questions
It seems that the Monster UPS and the PureAV AP30800 both output something other than sine waves, more like a stepped square wave (look at the .jpg image in post #58 for an o'scope view of the Monster output). I looked with an oscilloscope at the output of the APC BE500R UPA I have connected to my Sammy HL-S5087, while I pulled the wall plug. Expectedly, the nice clean utility-grade sine wave output changed over to a stepped square-wave approximation of a sine, and the Sammy kept right on going without a problem. I plugged the UPS back into the wall, and the output switched back to the utility mains power after a second or two.
FYI, I looked at the schematic of the Sammy input power supply. The first thing that the incoming 120Vac "sees" is an input EMI filter (built up a tranzorb, resistor, capacitors, and common-mode inductor) as expected for a switch-mode power supply. This feeds a couple of full-wave bridge rectifiers, and the rest is typical switching power supply technology.
Bottom line IMHO is that, while the outputs of the less-expensive UPS units (APC, Monster, PureAV, etc. - if the marketing stuff does not specifically say "pure sine wave", it probably is just a stepped square wave output) are pretty dirty, the input power supply components in my Sammy DLP could care less about the poor sinewave approximation coming out of my APC UPS, much less be damaged by the waveform of the stepped-square wave power input.
That said, I may STILL upgrade someday to something like a APC SmartUPS which I understand DOES include a true sinewave inverter. I can probably use the inverter output to power something else which truly NEEDS a pure sinewave power supply.
That's a long post, but just one person's opinion...