Anecdata but: I bought the 16" MBP when it was first released and have never had a problem with it (or with any of the work-issued MBPs I've been issued in the interim as well). I had a butterfly-keyboard MBP from work for a couple years and while I didn't like the feel of the keyboard (I'm happy with the post-butterfly MBPs' keyboards), I never had the dust particle issue with it.