Are coffee enhancers bad for you? I buy Buisman Royal Aroma Coffee enhancer from our local Dutch shop.  It halves the coffee grounds needed and makes the coffee taste stronger.  It is basically burnt sugar, as far as I understand.

Is it bad for you?
That site that you linked (from www.buismaningredients.com, and this one) suggest that the main ingredient is caramelised sugar. The claim is simple enough: "caramelised sugars enrich the taste of coffee" (from cited articles). Caramelisation is the thermal decomposition of sugar (sucrose); not precisely "burnt" as such but similar. 

I can't find any ingredient list for that product, but the company that makes it basically produces just caramelised sugar and caramel color. I can't find any negative health claims for caramelised sugar itself other than the basic ones for regular sugar (blood-sugar effects, teeth effects, etc.). Some have concerns about caramel color.