I've found the Stairville Mains Extension MC 10m 1,5 mm² to be a reliable choice for my needs. The cable feels heavy-duty and sturdy, which is a significant advantage. I appreciate that it's made with a caoutchouc material, which seems more durable than PVC. The thickness of the cable is also a plus, making it less prone to damage. I've used it both indoors and outdoors without any issues. One thing to note is that the connectors are not detachable, so replacement might be necessary if there's a problem. However, this hasn't been an issue for me so far. Overall, I'm satisfied with the quality and performance of this extension cable.