If you are buying the Tilt-Shift for creative blur or the "Tilt" effect you'd be better of doing it in Adobe CS6 or CC.
It's probably more effective.
I have the 24 TS-E II and I love it. I use it quite a bit and it makes me feel like a real photographer but I probably get better shots from my 17-40mm.
I think the camera is better at autofocus than an eye is at manual focus - just my opinion that may be factually incorrect
. I have excellent eye-sight and it's easy to have an out of focus shot on a manual lens.
If you over tighten the screws on a tilt shift you could head for big trouble.
If you don't tight enough the lens will drop and go out of focus.
The advanage of manual is it slows you right down and makes you think.
A TSE is a difficult lens to manage correctly.
It's not self explanatory.
Generally very little tilt is required to get that big depth of field look.
I opted for the 24 mm because I could add Lee Filters.
No regrets. I think Extreme Shift left to extreme shift right is approx the equivalent of 19mm (again could be technically incorrect
- its pretty wide anyway)
It looks great as an lens.
Bulbous lens of the 17mm make me more nervous for some reason.