I think that it's worth adding that all Smokefires run the same software and firmware. Weber says that it's a software upgrade to the Gen2, which it is. It was also an upgrade to all Gen 1 grills.To toss in my 2 cents and add to what Lew said above. The biggest hardware difference is the 1 piece auger. The rest are small changes. The other big changes were done with software updates to make it operate better/smoother.