Just no. These kind of plugs are the surest way of destroying your pedals in any frequent use. Although the connector is symmetric and you might think of saving real estate to your pedal board, it's extremely rare that your pedals' jacks would sit in perfect 90 degrees angle, not to mention on even height with each other. Usually this doesn't happen even with the pedals of same manufacturer, since there's usually at least a slight slant in the side of the pedal.
So, plugging two pedals together with this creates tension between the jacks, and this tension reaches into the circuit board inside. When stepping on a pedal, this tension is very, very bad news to the insides of the pedal. Eventually you WILL end up breaking your precious pedals with these. Yes, these are a tad better than the straight version, but the asymmetrical shape still does not prevent the tension between the pedals happening when stomped on.
They may seem to be a good idea on paper, but terrible in practice. Use patch cables instead, and if the space is that much of an issue, there are also flat jacked patch cables from few manufacturers.