In considering your question.....
I thought about it for about 20 minutes or so.
I bought the 1150. There were a bunch of us all went and got them within a couple weeks of each other. I had been wanting a grill, and a smoker. This fit the bill.
I love this thing. There are two issues I have found with it. Neither is a deal breaker, and both of them have been modified.
1) The metal grate over the pellet hopper. I know why its there, to make sure people do not stick their hands down there and get their fingers hurt in the pellet auger. It is just annoying when trying to level out the pellets on a long cook. I just removed the whole grate because I am smart enough to not put my hand in there.
2) I feel that there is an *obvious* design flaw regarding the left side of the grill, where the heat shield has a 1/2 to 3/4 inch gap across the entire shield that allows the heat to go up right over the barrel temp probe. I had a 50 to 60 degree temp difference between the left and right side of my grill. I purchased a "mod". and installed it. Problem fixed. Now no more than a 10 degree difference between the left and right sides.
So there are a LOT of comments and threads about upgrading the controller, and the horrors of it. I have not upgraded mine. It works very well. Still fence-riding on whether or not I will.
Now. Would I buy this one again. Yes. Yes, it would have the same issues, and they would be fixed in the same way as mentioned above.
BUT.
I'm honestly debating if I need an 1150. I could probably make everything I wanted to, on the 820. Basically the same thing...just smaller.
And from what I understand, THAT one has the heat shield that keeps the heat from going up across the temp probe.
I cant give a firm, "I would buy the 820", or a firm "I would buy the 1150"....at this time. I would buy one of them again. It is absolutely an awesome beginner pellet smoker grill.