Product review (1 stars): Viking Service is Awful
I have a Viking 48 inch gas range withthe old style open burners and gas fired ovens.

 The ignition system on the burners went out, as it has for many, many Viking Range owners. The service tech replaced the spark module not once, but twice, with defective-from-the-factory units. Unfortunately there was a long wait between each attempt. I eventually found an alternate replacement part number from a discussion board and used that part to fix the problem. Viking never did solve the problem for me, I had to do it myself.

Meanwhile the burners in the ovens were having issues with ignitors. The oven burner would also regularly mis-light, igniting the gas in the venturi section of the burner instead of at the burner itself. That was always a bit scary!

The large round gas stove top burners make it impossible to simmer and just as impossible to use small diameter pots or pans. The physical placement of the flame is in a large diameter ring, which works fine for big saute pans and stock pots, but don't try to melt a little butter in a small pot, or heat up a cup of water in a 1 quart sauce pan! The flame super-heats the outside of the pot while leaving the middle relatively cold!  The large size of the burners means that there is far too much heat to simmer even when the flame is carefully turned down to its lowest possible point. There is simply too much flame there!

 I see that Viking now calls their griddle a "Simmer plate." Unbelievable that you could spend $6k or more on a "professional" stove that requires you to use a griddle to simmer!

 Service stinks, reliability is lousy, and even when the thing is working at optimum performance it still is a disapointment. Buy something else!