Delivery was a little late, but the product is perfect (we had a power outage just days after I received and installed it, so I was happy that I had it when I needed it).

I bought 2 older versions of this unit five years ago. Both have worked flawlessly during that time, until a couple weeks ago when one of them must have developed an internal short. One side quit providing power. So, I immediately went to B&H and ordered a new one. It was delivered quickly and was simple to set in place of the old one. My computer equipment is expensive and very important to me as a photographer. I wouldn't be without these units.

This was purchased as a replacement. This is same as the @ Atvia branded unit which I owned and lasted for 6 years before it died. This unit so far has operated as reliable as my other united. I've also owned APC brand.

B&H Photo has the best customer service, fastest response i have ever seen from any online store, keep up the good work. u became my first choice for any electronic product.

This new unit works well and this my second CyberPower back up power supply. I am very satisfied with both the older one and the new one. We have had a number of power disruptions in our area and the CyberPower CP550SLG Standby UPS has saved the day.
I recommend this product.

I bought three CP550SLG, stand-by UPS power units. They work out of the box without any kind of problem. I have installed them to protect my three computer areas in my home and home office. We already had a power outage and the two systems that were working continue to work for about the 8 minutes of the outage duration. If you own any kind of expensive electronic equipment at home or office, I strongly recommend getting this stand-by UPS system. There is nothing like peace of mind!

The CyberPower 550 has been attached to my office equipment for several years. Recently I bought another CyberPower 550 for TV and DVR components. The CyberPower 550 has always worked well.

My big complaint about UPS units (not limited to this one) is that only half of the available outlets supply battery backup. I needed an additional UPS for several low-draw accessories because my larger UPS couldn't accommodate all of them. That being said, this is a very nice unit, good power characteristics, and good outlet placement for those odd-shaped plugs.

Works to protect an ancient always-on EeeBox computer. My first one of these lasted about 5 years and I probably could have just replaced the battery, but I decided to wait on that and possibly just keep as a backup (a backup UPS does seem a little redundant). With the monitor off, this keeps the computer on for almost an hour.

I recently bought these 550VA UPS with sinewave to protect my electronics; particularly my expensive large TV panels and AV units. The fact that these generate a sinewave helps to improve the quality of signal output from AV as well as images by reducing voltage fluctuations. Prior to these UPS units, I bought 440VA units and were very happy with them. And these have a little more battery headroom.