We're considering buying a high quality range. We have arrested our choice on 36" dual fuel ranges (gas top, electric oven, preferably convection).
Some of those have fairly typical and unique characteristics (e.g., Aga multiple small ovens). Others are more easily compared (e.g., Viking and Wolf have similar product offerings).
What are the key things to consider before buying a range? Are there good online resources to understand the quality of those premium brands, especially some frank assessment of Wolf and Viking? Also interested in personal experiences - customer or repairpeople reviews and assessments.
EDIT: We eventually got a Wolf set, because I read and heard slightly better things over the Viking, and I couldn't find true comparisons with some of the lesser known premium brands. Overall, I am happy. I find that the gas burners don't heat things as hot as an electric top, and ideally I would have liked to have 3 gas burners and one electric element. We selected to have a grid in the center rather than 6 burners, and it's great but not used very often (but then we wouldn't need 6 burners very often either). I love to grill veggies on it.
The 36" oven takes a while to heat up. You get used to it, but for the first few weeks, it was obnoxious. Also some recipes call for changing the temperature of the oven from very high to much lower (e.g., for some roasts), and an oven that size takes a long while to cool off. The size is convenient to make large batches of cookies, but we haven't needed the width for anything else really. If I had infinite means or were building a kitchen from scratch, I would get two smaller ovens.