I want to buy my husband a smoker for Father's Day. A friend showed us his Mastberbuilt and my husband really liked its "set it and forget it" ease of use. While surfing around I found 2 units that have the same description on Amazon. Masterbuilt 30" 20070213 () and Masterbuilt 30" 20078715 () I can't tell if there are actually any "improvements" between the two. Right now I can get the 20070213 for about $100 cheaper than the 20078715 but I don't want to go cheap if there is actually a functional reason to get the 20078715. I saw it mentioned on Amazon that you can change out the controller and circuit board in the 20078715 if it breaks but you an't do that in the 213 model. How much does the controller board cost and how hard is it to change? How likely is it to break?