Well it's a really nice surge suppressor, better then any power strip. Most of these will also boost and buck voltage if your having a bad power day.
I liked the idea of being able to safely turn of the machine in case of a power outage and the extra mega protection they offer your equipment.
I bought my first one for 118 8 years or so ago and it worked very well until last summer when the load finally cuaght up with it.
I wanted another one so I watched e-bay and got the big one for 156 delivered, now I can sit here and surf or finish my game or cd/dvd project and not worry for a half hour.
You don't need one but it sure is that little extra peace of mind if you got one, and yup if your running mission critical stuff or have a server it's a must I'd say.
I got the last one just becuase it was cheap and now everything that is part of the network has a UPS
None of us need our CDRW's either, or the computers, or big audio video systems. It's a don't need but want thing