Product review (3 stars): GE Downdraft Cooktop Replacement
Replaced an outdated GE cooktop with this one.  Cooktop performs extremely well.

Thats the good news...  The bad??  Replacement was a disaster! In their infinite wisdom, GE CHANGED the downdraft connection from a 6" round pipe to a 3x12 rectangular connection.  It was almost impossible to reconnect to the existing vent piping.  If you are replacing an older GE product, you will need to get some FLEX piping!!!! Note - blowers will not interchange with older models, so you can't just 'steal' the old blower /housing and re-use...  Whoever the design change person is in GE, they need to have to test-change out their products and see what a pain they've created by the change!!!!!!!!!!