NOTE: Flavorings really should not be needed in good coffee but we
all want something a little different every now and again. As a general
rule, adding your own flavoring is a better approach to drinking
flavored coffee than buying pre-flavored coffee. Commercially-flavored
coffee usually uses a low quality bean since most of the flavor will be
masked by the chemical flavorings anyway.
So be warned – in many cases you are paying a lot for low priced coffee beans that have had a chemical added to them to make them more palatable. It is my opinion that if you start with a good quality coffee, there is very little need for external flavorings.
As with all things coffee, go with your taste. If you like flavored coffee, by all means drink it!
One last note. If you buy flavored coffee wash all your coffee equipment
thoroughly after brewing flavored coffee. The flavoring agents used will
stick to anything used with them. Do not use the same coffee grinder to grind flavored and unflavored coffee. It will take approximately 20 grinding of coffee to remove all the flavoring agents that stick to the internal part of the grinder.