It's a very nice lens! As I'm sure you know, it's about knowing the photo you want to create.
Greg Heisler did a portrait on the diagonal of Bill and Melinda Gates with Bono, and he used a 90mm tilt shift lens. It was really nicely done.
I have enjoyed all 3 of the TSE lenses I have used...never used the 90...but the 17,24 and 45 are all great.