Only done the American pale ale, which I dry hopped with cascade and it is quite good.
The RIS is pretty good. It was my first kit. It's extract + steeping grains(roasted barley, black patent and caramel 60, I think) and turned out pretty well. I'm not sure if a single packet of s-04 is sufficient for a brew that large. It got down to 1.030 pretty quickly but 1.030 to 1.020 took 2 or 3 weeks.
The holiday ale didn't turn out as well but that was entirely my fault. It was my second batch and I got a little too big for my britches in making modifications to the recipe.
I've done half a dozen or so:
Scottish Ale, Imperial Blonde, Pumpkin Spice Porter, India Black Ale, Oatmeal Stout, Weizenbier
I'd have to say my favorite by far is the India Black Ale. My kit came with Millennium and Zythos hops, and Danstar Bry-97 dry yeast. Delicious roasty, coffee, dark flavors, and plenty of hops to go around. ABV 5.3%. It's the only one out of 12+ recipes i've done so far that I will definitely be making again. In fact, I should get on that now; I only have three bombers left.
Cheers.