Well, one thing I cannot find in this thread is the word "joule". And it is really the only word that matters with power protection.
When I started I did not have any protection other than the little lumber store power strips they called "surge protectors". Pure crap. I wasted a lot of money replacing computer power supplies and rack mount displays, etc. because of summer thunder storms and downtown surges from construction workers cutting lines or whatever.
I finally decided to look for better protection. In doing the research, I learned that the only thing that really matters is how many joules of raw electric power a unit can absorb before it blows. A "joule" is (correct me if I'm off base here....I'm not an engineer) basically the raw "horsepower" of electricity measured in foot-pounds, or how much juice it takes to move 1 pound a (vertical??) distance of 1 foot. I found that a lot of those cheap surge protectors are only rated for 50 or 100 joules. That's nothing in a modern household. I felt lucky the day I found a large strip rated for 800 joules at a lumber yard selling for a mere $39.
I ended up buying the Tripp Lite LC1800 units. They are rated in the thousands of joules, and they are guaranteed against direct lightning strike if a strike ruins your gear while running behind the unit. Since that is exactly what happened to me (lightning hitting overhead lines outside my house) I tried it. Since then I've heard the loud clicks and pops when it "takes a hit", but I've not spent one more dime on replacing power supplies or anything else.
If a power conditioner of any kind does not give a joule rating, dont buy it. Anything worth trying will give a joule rating. Buy the unit with the highest joule rating you can afford, and if possible get one that includes UPS for power failures. UPS is the only other feature I wish mine had. The Tripp Lites protect against momentary brown outs or voltage sags, but not against total failures. I dont know if Tripp Lite is the absolute best way to go, but I do know if you use the "max joule rule" when you buy, you will never be disappointed in the thing if and when it finally has to do its job.