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those branded ones are mainly designed for p4 systems and they are not 700W at all. there are a few Dell XPS series PSu, they cost around 6k for 750W, and are extremely good gaming PSU..but they are ver rare, very rarely original, and not as cheap as you would think..
if you are referring to those second hand PSu sold in market, the reason i stated before in the previous post , quote here, is why. they are very old gen, and highly used psu used in a 24/7 office environment for basic pc only, providing low watts at amps which are much less than what a modern pc uses due to improved and very changed intel universal power specs.
if you are to be running a small system with a proc mobo ram and an average or builtin GPU for a long time, like a spare office pc, then those PSU are fine.. for casual gaming watching movies, and adding lots of HDDs, and System casing fans, donot expect them to last long
some of them are in great condition and are good quality ones, but since all look the same and you canot test them,you are stuck with lucky draw.
i wuld also suggest if you want to save money, buy from PG sellers selling Corsair, Antec and CM psu in bulk.. they have it at much cheaper than new price and are fairly powerful PSu, Corsair and Antec 460-550W are common, and are very high quality brands at almost 1/3 less than new price. sellers are also highly reputed. and will provide after sale cover for a couple of days.