A cheap one is MOV based and they degrade every time a surge is absorbed. After some time they won’t protect anything.
I would buy a UPS (battery backup) with a pure sine wave output. A battery alone is a excellent power conditioner. It will cover brownouts and all sorts of shit.
Now people are buying $2500 plasmas and other $$ gear. I would not be a cheap fuck (also read STUPID) and buy a shitbox strip from Wally World
btw Monster Sucks… Buy Tripp-Lite or something