I looked at the K-Mix reviews when I was obsessively researching, there is a very good thread on here, I'll find it later.
The reviews are good, but I kept comparing them to the Kitchenaid and for the difference I'd go KA. My friend is a cake maker and she says the same, she has a KA. A very important factor for me is that there is only a little difference price wise between the Kmix and the KA, but Kmix offer a 1 year guarantee and KA offer five years.
But as I don't exclusively bake I wanted all the attachments too ....enter Prospero/Chef
So for me in the K-Mix budget it would be between Chef Titanium?KA?Kmix the Chef would win on versatility 
Oh also I think the KA is better with smaller amounts of mix than the KMix iirc.