Apparently Ikea kitchen appliance are, in general, made by Whirlpool. Their vent hoods appear to have Elica blowers in them. I don't know about the specific pieces you are considering. The Ikeafans site may have more information.

An earlier thread here suggested that if you are buying them as part of October's Ikea 20% off kitchens promotion, that they aren't bad choices for the price.

The 27"w and 30"w ovens are standard Whirlpool fare, with different control panels designed to look more European. The 24"w oven is quite different than anything Whirlpool sells in the U.S. under their own brand though. I'm not sure if this is based on an imported Whirlpool design or a rebranded appliance from a different manufacturer. It looks better made than the larger Ikea ovens.