I don't know if this is a coincidence or not, but the first steam mashed beer I ever brewed is the best beer I've ever brewed.
I got the recipe by converting an extract recipe.
I don't know how to describe what makes it good except to say that its very clean. I haven't brewed for 7 years, but my previous beers were always a bit harsh. This beer doesn't have any harshness to it at all. Its very smooth and it has zero after taste. I am very happy with it and its only been bottled for 8 days.
Its just a touch tart. You get just a tiny bit of pucker and just a hint of cranberry. I think it turned out really well.
Now my wife wants me to squeeze in another brew before I stop for the summer. Funny, she said that last weekend too. (I brewed the Blue Moon clone for her last weekend...)