Steam rack ovens/ranges

[rustwood]

I am starting to look at ranges for a kitchen remodel and I came across some KitchenAid models with a "Steam Rack" feature.  Here is what the manual says:

 

Quote

 

Steam Bake

The Steam Bake function works in conjunction with the steam rack
to provide additional moisture during baking. The steam rack
contains a water reservoir which heats up and releases steam in to
the oven cavity during the steam bake cycle. There are 3
preprogrammed food options to choose from: Breads, Desserts
and Fish, as well as a Refresh/Reheat option.

 

For best performance, place the steam rack in the lowest available
rack position in the cavity and pour 1½ cups (350 mL) of water into
the reservoir.

 

 

I suppose the key is that the rack has some sort of independently controlled heating mechanism to provide the 4 different modes.  Of course that could be nothing more than a damper in the vicinity of the rack which opens to various degrees or at different times depending on the setting.  Does anyone have any experience with these racks?  Are they anything more than a marketing gimmick?