Oh my goodness, they are fab! I have one. Playdough is a breeze. I made a batch in 3 minutes this morning, and only 30 seconds of that was mixing it. The dough hook is amazing.
I use it regularly for everyday tasks. So mashed potato using the Kbeater. I have some of the attachments. I use it for slicing carrots, mushrooms, etc., grating cheese for a cheese sauce.
Meringues are easily produced, anything that requires mixing, beating, etc.
Cakes are great. Actually, I use an all in one recipe, and I literally dump the ingredients in the bowl, whack the dial around, and pour/scrape the mixture into a tin. A cake mix takes about 45 seconds or 1 minute once you have weighed the ingredients.
Mayonnaise, etc. is also easily made in a kenwood.