First off, in general I was a huge Traeger fan due to my brother-in-law smoking up meat and fish for us for the past 3 years and it was just damn delicious. He also just raved about his Traeger, so finally I took the plunge and purchased a Century 34 model during one their Costco road shows. Customer Service - In general I will give them 4 stars because I am talking with a human, they were seemingly very thorough when I spoke with them and didn't appear to be reading from a knowledge base article when I described the problems. I also grilled them to ensure that the Costco specific model wasn't being manufactured with subpar parts since the price was so much less than retail and seemingly more bells and whistles. More than one representative confirmed that was not the case. This is where it stops being good news.
The SG and ZG are not exactly the same though. Just from the pictures I can see that the bases are different. The SG has L-shaped legs and a bottom shelf while the ZG has square legs that are larger than the DLX legs but no bottom shelf. There were also different specs for many features. I took a picture of the ZG spec sheet at the store and compared it to the SG specs on the website and there are slight differences in capacities. For example ZG 3778 cubic inch - SG 4859, grilling area ZG 776- SG 811, hopper volume ZG 18 lbs - SG 22, ...
You want even grilling: One of the downsides of using a charcoal grill is ensuring that the entire grilling area is evenly heated. Spreading the charcoal evenly and avoiding hot spots is difficult. Traeger’s pellet grilling system overcomes this problem with a fan that evenly distributes the heat throughout the grilling area, much like a wood-fired oven would have.
Although these are marketed as grills, they do much more, including baking or roasting. Because they heat by convection, you might not get the grill marks that a gas or charcoal grill will give you, but you also won’t have the flame-up problems. While many pellet grills offer high cooking temperatures, the maximum depends on ambient temperature and wind. Many users wrap their grills in special insulating covers to help maintain heat, reduce fuel use, and reach the higher temperatures they desire.