I have only purchased weber grills going back to the 1990s.  I have had several 3 Genesis grills and 2 Summits.  They are excellent for cooking a great variety of things because it is very easy to control (and adjust) the temperature on them.  Sadly each successive grill I have purchased has been of a lower quality.  While I can live with the cheaply made cabinets (used to be a lot nicer), the plastic knobs are ridiculous.  They keep breaking and are a very poor design.  They crack on the inside when you try and turn them off and are rendered useless.  I have ordered additional knobs at a ridiculous markup, but it has finally gotten to the point that I won't be getting another one.  I bought a new Summit 670 this Spring and broke 3 knobs in the first month.  Very disappointing.