Hey Dan,
I tried the Cool Rails and found it lacking, it wasn't a thick sound... more of a tubey Stratty type sound. The Little 59 is in my guitar in the neck position now, but i'm not happy with it. Then again.. i never liked the Duncan 59 anyway, so it makes sense that i wouldn't dig the Little 59.
I'm in the market for a replacement that sounds thick and smooth, something along the lines of a Les Paul neck pickup tone. I'm thinking of trying the Air Norton S, since the description of it seems like it would fit the bill for what i'm looking for.