Product review (1 stars): Whirlpool model WDF750SAYW not recommended
I used it very little for 3 years and 4 months and then it started smelling like burning electrical/plastic.  It turns out the control panel needed replacing.  I purchased it in Nov 2012 for $450 and repair with parts and labor will cost $320  I am not happy with the life span of this unit and it was not heavily of regularly used.  It should have lasted longer I think.