I love my Kitchenaid stand mixer and my Kitchenaid hand mixer. I've had the stand mixer for 17 years & have never had any problems with it. The stand mixer was a gift from my hubby to replace an old Oster stand mixer that I had that was also a very good mixer, but it had been my mother's before it was mine and had seen many good years before the motor finally went & I couldn't get replacement parts for it. I use my Kitchenaid stand mixer for making bread and it handles double batches of cookies with no trouble at all. We have a few of the attachments that my DH bought me as gifts, but I really don't use those much, so unless you know you are going to use the attachments a lot, I wouldn't bother getting them, as they are pricey.
I bought the hand mixer about 7 years ago and, the same, no problems with it. Before I got the hand mixer, I had burnt up the motors in at least 5 hand mixers previously (all different brands, too).