The layout of each plug in gives the fit for maximum number of plugs unless you use the square plug from gaming device or mobile phone devices. I have not had a surge to test it out if the manufacturer claim what they claimed for this thing to do. This winter, when I have to use my portable heater of 1500 W rate, I plan to have on the low side, hopefully it won't trip it, though I tested the heater in the spring time when the weather was still nippy. I had the heater on for about 1/2 hour run on continuously, I didn't see any tripping. I would recommend this for the way the outlets are laid out because many other strip protectors have the outlets face each other so the other end of the same plug takes up the space of the next outlet so you loose an outlet to use.
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