There are some slight differences from the Costco model and the normal Elite. It is model BBQ07C instead of BBQ07E.
The Smoke Stack cap and door are not in Stainless steel (Bonus in my opinion) they are
in normal black powder coat like the standard Lil Texas
The BBQ07C only has two wheeled legs not four.
Besides that the BBQ07C is exactly like the BBQ07E and even has the newest digital temperature controller.
On top of the 3 year warranty you get from Traeger ...Costco gives a lifetime money back on these.
MSRP for BBQ07E is $799. Normal price is probably closer to $699. The BBQ07C is only $399.
Here is the kicker... The BBQ07C is a new model and will be carried in Costco stores on an ongoing basis. During the Traeger events the sales guy will not display these and will hide or remove the price sign above these... He does not make a commission on these.
I bought the Junior for $299 (smaller, not as well made and without digital thermostat for $299) and ended up returning it for this one. Just the thermostat alone is worth $70-80 dollars.