Siemans are rebadged Bosch Nexxt washers/dryers with basically the same features under the bonnet. Bosch and Siemans are part of the same parent company "BSH Group" and both divisons are planning major incursions into the United States major and small kitchen appliance market.
IIRC the Sieman units are only sold at Best Buy for the moment.
Bosh Nexxt washers are getting great reviews by some, others have had problems but that is to be expected with any new appliance model. A recall/replacement was done on the Bosch Nexxt washer's door but besides that have not heard of major problems.
Of all the tilt drum uber-front loaders would say the Bosch comes closest in "commercial" quality, IMHO. The door closes like that of an upscale Mercedes. That is not only is it heavy and soild, but actually closes itself. Some buyers are reporting excessive washer vibration during the higher spin cycles, but this could be do to flooring problems and the weight of the machine (about 215lbs).
Launderess