I have an Artisan model Kitchenaid mixer and it's my #1 favorite appliance. I never put it away because I use it so often (and it's so heavy!)
I bought mine on Amazon as a refurb, it only cost $150 and it's worked like a dream for the ...wow, nearly 10 years I've had it, now. Not a single problem.
To me, it's worth the investment if it's an appliance you think you will use often. If mine died today, I'd be buying a new one tomorrow!