Precons: Which ones have you taken apart, which ones are your favorite, and which ones do you run the Second Commander?

So I have the Miracle Worker precon at the moment and while I like the concept I find the primary commander Aminatou to be a tad slow, so I am going to be trying out Master of Keys.

But in realizing this, I started to wonder how other people felt about the precons they have gotten. Which ones do they still have and play as is, and which ones do they only use the Alt Commander on, and of course, which ones have been taken apart as fodder for other things!