I bought the unit back in May which replaced one of the old 30" model that I had used one the last 5 years.  The bigger size is definitely nice...can fit a whole brisket for example and could not do that before without putting something underneath it to bend it.

Aside from the larger size the best feature by far is the new smoking box with independent heating element offering 5 temp settings and taking any size or shape from chips to chunks, allowing you to smoke constantly for up to 2 hour without refilling. .  The next best new feature is the larger/stronger main heating element which significantly speeds up both pre-heating and re-heating after opening the door. 

I have recently ordered a number of other add-ons such as the upper broiling element and rotisserie...which worked well for the rotisserie chicken which was able to be smoked and broiled simultaneously.