I am a VERY fussy eater but I found these pens tasty enough. The chocolate tastes like what you find at the bottom of a cornetto and the strawberry tastes like minimilks.
The only problem with these is it's very hard to get the stuff out, especially the chocolate one. I normally try biting them cos my hands aren't strong enough to squeeze it out. Because of this, you can't really write well, so don't expect to make great works of art.