We bought our KSM150 in 2004. It works great and we like it but it does have a design flaw that takes skill and money to replace. The transmission casing is metal and all gears except one are metal. The one non-metal gear is a worm gear that is plastic part number W10112253. Jot this number down as you will need to purchase it several times along with replacement grease. When using the mixer for stiff batters or bread dough, you can not push the 2-min limitation given in the manual. If you do, the plastic gear gets hot and fails. When this happens, you need a variety of tools, a specific repair manual and about an hour of time to replace the worm gear with a new one. I've done it three times in four years. I've talked with KitchenAid about this design flaw and they seem unreceptive to making a metal gear for this model as they have done with their professional 600 series which also had the same problem although with a plastic transmission casing instead of a plastic gear as with this model. It seems like they keep trying to push plastic in their mixers and it just doesn't hold up with time. For now, I'll probably keep replacing the plastic worm gear when it fails since I bought it in bulk the last time to save money. However, my next mixer will have all metal transmission and gearing and probably won't be KitchenAid.Get more detail about KitchenAid KSM150PSER Artisan Series 5-Quart Mixer, Empire Red.
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