A VGA extension cable is really no different no matter which you get. The main factor in purchase decisions really should just be the length and the price. This cable is fairly cheap and at 15 metres is is a decent extension cable for most needs. Bigger isn't necessarily better as getting a cable too short will defeat the purpose of buying the extension but too long will leave you with a heap of unused cable which will also add to degradation of quality as VGA is an analogue signal instead of a digital signal as HDMI is.
This cable is a dark black which I prefer over all other colours as it means it generally blends into the background and is pretty inconspicuous. You don't really want to notice cables around your gadgets you just want their functionality.
The dooyoo description of this cable says that it doesn't loose quality and I would agree. Although at 15 metres I would really expect much to be lost, there doesn't ever seem to be any degradation in the quality of the image when connected over a direct link. The ferrite bead on the cable may be the reason fro this along with just simply being of high-quality material.
There is really little more that I can say about this, but in all honesty, I see no reason not to get this as it has no shortfalls whatsoever.