Nothing wrong with Contactum, but then there isn't really anything wrong with any of the brands. They are all made to the same BS / EN standards.
Some may be a bit more flimsy or have less space inside for wiring leading to various personal preferences. Ask 10 people what they would get and you will get 10 different answers.
Some may be a bit more flimsy or have less space inside for wiring leading to various personal preferences. Ask 10 people what they would get and you will get 10 different answers.