Good question. For simply joining two or more cables, things like "Wago" connectors are used all the time.............
http://www.screwfix.com/c/electrical-lighting/wago-cable-connectors/cat5260002
I can't say I've ever come across the sockets you mention though. That doesn't mean anything of course, but I can't remember having seen any in my local wholesalers.
My only concern would be how "demountable" they are. Can the cables be removed easily?
I would imagine they're fine. Simply a matter of preference.