Something we noticed. We have a Q1200, which we got this year and have cooked on it....well a about 12 bottles this year ;)
We found a Q120 on leftover/closeout a short while ago. It had a cast iron grate that was UNCOATED. Ours has a (ceramic?) coated cast iron grates.
The wings are kind of flimsy, but hold light items well. Any larger would be difficult for us to carry in the space we have. Any smaller wouldn't quite meet our needs.
Yes, we can overload it, but most of the time it is good for 3-5 of us. 6 just starts to push it. More, and we have to cook in batches.
It's pretty light, even more when you remove the 2 piece grates, though they can be messy.