Product review (5 stars): Completely painless
Looking around, I noticed other vendors selling similar belts for a fraction of the cost.  Read some reviews and noted a bit of a mixed bag, particularly with regard to quality and performance.  I don't recall my exact thought process at the moment, but I decided to order these belts from this vendor.  They arrived within days and, not only were they exactly as advertised, but they are in fact OEM (marked Whirlpool and, I believe, made in the USA) belts.  Installation was a snap and, after several uses, I have nothing to report - no odors, noises, etc.  So I suppose that makes them perfect.