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Car add-ons (ie. car alarm, reversing camera, parking sensors, etc.) being provided by car dealers at trade prices come really cheap. Are they any good at all? Is there anything to be aware of like a recognized or authorized car security alarm installer by the government or any consumer-protective body?

Not sure what you refer as being cheap but basically you get what you pay for. The best option is to stick with a product that's been around for some time and has a decent warranty and backup service. Dynatron is one such company that we are aware of that fit these accessories to motor vehicles. You can give Dynatron a call on 0800 508 904.