Excellent product, if the specifications are followed.
The product is excellent and not too expensive, but the casing is relatively fragile if the connections aren't tightened properly. The recommended tightening torque is between 1.7 and 2.4 Nm. This is really not much and very easy to exceed. The plastic casing doesn't withstand overtightening. (Carling states that new products are made of a stronger plastic.) Mine was over ten years old, and it literally exploded when I tightened the nuts. If you don't have a torque wrench, be sure to hold the lower nut while tightening the upper one. The terminals are held between two nuts. Note that these are conductive nuts and washers; do not replace them with stainless steel nuts and washers.