It's interesting how PET is the new attention grabber for carpet cleaning. My parents are in their 90s and they needed a lighter weight machine to take care of the spills and stains associated with people their age such as coffee cups getting spilled and dinners knocked to the floor while getting up from the living room chairs. (I won't mention occasional incontinence issues but that is happening.) Sooooo, lets just say "pet stains" are an issue too. All the power of the long standing model used for over 10 years is now available in a lightweight option. I couldn't be happier to have found this new upright cleaner for them and they are pleased with its ease of cleaning.